Export of internal Abseil changes

--
20b3acaff75d05315f272747956b01405adccafb by Greg Falcon <gfalcon@google.com>:

Re-import of CCTZ from GitHub, with new ABSL_NAMESPACE_ transform applied.

PiperOrigin-RevId: 285564474

--
4d9e3fcabcea33c8b0b69f094ad2eddc0fa19557 by Derek Mauro <dmauro@google.com>:

Moves the disabling of a warning to before the function begins.

MSVC apparently requires this for warnings in the range 4700-4999.
https://docs.microsoft.com/en-us/cpp/preprocessor/warning?redirectedfrom=MSDN&view=vs-2019

PiperOrigin-RevId: 285516232

--
4a060cbeda76e89693c50276ae5b62cbf0fff39a by Derek Mauro <dmauro@google.com>:

MSVC: Fixes uniform_real_distribution_test in opt mode

Disables a constant arithmetic overflow warning in a test that tests
the behavior on overflow. This should be tested because a user might
have this warning disabled.

PiperOrigin-RevId: 285452242

--
548ab2f4cbe59bd6f6bf493af4f9ea765c4fa949 by Andy Soffer <asoffer@google.com>:

Release absl::bind_front, a C++11-compliant work-alike type for the C++20
std::bind_front.

PiperOrigin-RevId: 285247872
GitOrigin-RevId: 20b3acaff75d05315f272747956b01405adccafb
Change-Id: I00fe45939246cba9bfc7be375d67787d2eb57cd3

31 files changed, 1972 insertions, 1421 deletions

diff --git a/absl/functional/BUILD.bazel b/absl/functional/BUILD.bazel
index 0a7b588e..432546ce 100644
--- a/absl/functional/BUILD.bazel
+++ b/absl/functional/BUILD.bazel
@@ -27,6 +27,32 @@ package(default_visibility = ["//visibility:public"])
 licenses(["notice"])  # Apache 2.0
 
 cc_library(
+    name = "bind_front",
+    srcs = ["internal/front_binder.h"],
+    hdrs = ["bind_front.h"],
+    copts = ABSL_DEFAULT_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        "//absl/base:base_internal",
+        "//absl/container:compressed_tuple",
+        "//absl/meta:type_traits",
+        "//absl/utility",
+    ],
+)
+
+cc_test(
+    name = "bind_front_test",
+    srcs = ["bind_front_test.cc"],
+    copts = ABSL_TEST_COPTS,
+    linkopts = ABSL_DEFAULT_LINKOPTS,
+    deps = [
+        ":bind_front",
+        "//absl/memory",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_library(
     name = "function_ref",
     srcs = ["internal/function_ref.h"],
     hdrs = ["function_ref.h"],
diff --git a/absl/functional/bind_front.h b/absl/functional/bind_front.h
new file mode 100644
index 00000000..4c61d0ec
--- /dev/null
+++ b/absl/functional/bind_front.h
@@ -0,0 +1,152 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// `absl::bind_front()` returns a functor by binding a number of arguments to
+// the front of a provided functor, allowing you to avoid known problems with
+// `std::bind()`.  It is a form of partial function application
+// https://en.wikipedia.org/wiki/Partial_application.
+//
+// Like `std::bind()` it is implicitly convertible to `std::function`.  In
+// particular, it may be used as a simpler replacement for `std::bind()` in most
+// cases, as it does not require  placeholders to be specified.  More
+// importantly, it provides more reliable correctness guarantees than
+// `std::bind()`.
+//
+// absl::bind_front(a...) can be seen as storing the results of
+// std::make_tuple(a...).
+//
+// Example: Binding a free function.
+//
+//   int Minus(int a, int b) { return a - b; }
+//
+//   assert(absl::bind_front(Minus)(3, 2) == 3 - 2);
+//   assert(absl::bind_front(Minus, 3)(2) == 3 - 2);
+//   assert(absl::bind_front(Minus, 3, 2)() == 3 - 2);
+//
+// Example: Binding a member function.
+//
+//   struct Math {
+//     int Double(int a) const { return 2 * a; }
+//   };
+//
+//   Math math;
+//
+//   assert(absl::bind_front(&Math::Double)(&math, 3) == 2 * 3);
+//   // Stores a pointer to math inside the functor.
+//   assert(absl::bind_front(&Math::Double, &math)(3) == 2 * 3);
+//   // Stores a copy of math inside the functor.
+//   assert(absl::bind_front(&Math::Double, math)(3) == 2 * 3);
+//   // Stores std::unique_ptr<Math> inside the functor.
+//   assert(absl::bind_front(&Math::Double,
+//                           std::unique_ptr<Math>(new Math))(3) == 2 * 3);
+//
+// Example: Using `absl::bind_front()`, instead of `std::bind()`, with
+//          `std::function`.
+//
+//   class FileReader {
+//    public:
+//     void ReadFileAsync(const std::string& filename, std::string* content,
+//                        const std::function<void()>& done) {
+//       // Calls Executor::Schedule(std::function<void()>).
+//       Executor::DefaultExecutor()->Schedule(
+//           absl::bind_front(&FileReader::BlockingRead, this,
+//                            filename, content, done));
+//     }
+//
+//    private:
+//     void BlockingRead(const std::string& filename, std::string* content,
+//                       const std::function<void()>& done) {
+//       CHECK_OK(file::GetContents(filename, content, {}));
+//       done();
+//     }
+//   };
+//
+// `absl::bind_front()` stores bound arguments explicitly using the type passed
+// rather than implicitly based on the type accepted by its functor.
+//
+// Example: Binding arguments explicitly.
+//
+//   void LogStringView(absl::string_view sv) {
+//     LOG(INFO) << sv;
+//   }
+//
+//   Executor* e = Executor::DefaultExecutor();
+//   std::string s = "hello";
+//   absl::string_view sv = s;
+//
+//   // absl::bind_front(LogStringView, arg) makes a copy of arg and stores it.
+//   e->Schedule(absl::bind_front(LogStringView, sv)); // ERROR: dangling
+//                                                     // string_view.
+//
+//   e->Schedule(absl::bind_front(LogStringView, s));  // OK: stores a copy of
+//                                                     // s.
+//
+// To store some of the arguments passed to `absl::bind_front()` by reference,
+//  use std::ref()` and `std::cref()`.
+//
+// Example: Storing some of the bound arguments by reference.
+//
+//   class Service {
+//    public:
+//     void Serve(const Request& req, std::function<void()>* done) {
+//       // The request protocol buffer won't be deleted until done is called.
+//       // It's safe to store a reference to it inside the functor.
+//       Executor::DefaultExecutor()->Schedule(
+//           absl::bind_front(&Service::BlockingServe, this, std::cref(req),
+//           done));
+//     }
+//
+//    private:
+//     void BlockingServe(const Request& req, std::function<void()>* done);
+//   };
+//
+// Example: Storing bound arguments by reference.
+//
+//   void Print(const string& a, const string& b) { LOG(INFO) << a << b; }
+//
+//   std::string hi = "Hello, ";
+//   std::vector<std::string> names = {"Chuk", "Gek"};
+//   // Doesn't copy hi.
+//   for_each(names.begin(), names.end(),
+//            absl::bind_front(Print, std::ref(hi)));
+//
+//   // DO NOT DO THIS: the functor may outlive "hi", resulting in
+//   // dangling references.
+//   foo->DoInFuture(absl::bind_front(Print, std::ref(hi), "Guest"));  // BAD!
+//   auto f = absl::bind_front(Print, std::ref(hi), "Guest"); // BAD!
+
+#ifndef ABSL_FUNCTIONAL_BIND_FRONT_H_
+#define ABSL_FUNCTIONAL_BIND_FRONT_H_
+
+#include "absl/functional/internal/front_binder.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// Binds the first N arguments of an invocable object and stores them by value,
+// except types of std::reference_wrapper which are 'unwound' and stored by
+// reference.
+template <class F, class... BoundArgs>
+constexpr functional_internal::bind_front_t<F, BoundArgs...> bind_front(
+    F&& func, BoundArgs&&... args) {
+  return functional_internal::bind_front_t<F, BoundArgs...>(
+      absl::in_place, absl::forward<F>(func),
+      absl::forward<BoundArgs>(args)...);
+}
+
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_FUNCTIONAL_BIND_FRONT_H_
diff --git a/absl/functional/bind_front_test.cc b/absl/functional/bind_front_test.cc
new file mode 100644
index 00000000..4801a81c
--- /dev/null
+++ b/absl/functional/bind_front_test.cc
@@ -0,0 +1,231 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/functional/bind_front.h"
+
+#include <stddef.h>
+
+#include <functional>
+#include <memory>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/memory/memory.h"
+
+namespace {
+
+char CharAt(const char* s, size_t index) { return s[index]; }
+
+TEST(BindTest, Basics) {
+  EXPECT_EQ('C', absl::bind_front(CharAt)("ABC", 2));
+  EXPECT_EQ('C', absl::bind_front(CharAt, "ABC")(2));
+  EXPECT_EQ('C', absl::bind_front(CharAt, "ABC", 2)());
+}
+
+TEST(BindTest, Lambda) {
+  auto lambda = [](int x, int y, int z) { return x + y + z; };
+  EXPECT_EQ(6, absl::bind_front(lambda)(1, 2, 3));
+  EXPECT_EQ(6, absl::bind_front(lambda, 1)(2, 3));
+  EXPECT_EQ(6, absl::bind_front(lambda, 1, 2)(3));
+  EXPECT_EQ(6, absl::bind_front(lambda, 1, 2, 3)());
+}
+
+struct Functor {
+  std::string operator()() & { return "&"; }
+  std::string operator()() const& { return "const&"; }
+  std::string operator()() && { return "&&"; }
+  std::string operator()() const&& { return "const&&"; }
+};
+
+TEST(BindTest, PerfectForwardingOfBoundArgs) {
+  auto f = absl::bind_front(Functor());
+  const auto& cf = f;
+  EXPECT_EQ("&", f());
+  EXPECT_EQ("const&", cf());
+  EXPECT_EQ("&&", std::move(f)());
+  EXPECT_EQ("const&&", std::move(cf)());
+}
+
+struct ArgDescribe {
+  std::string operator()(int&) const { return "&"; }             // NOLINT
+  std::string operator()(const int&) const { return "const&"; }  // NOLINT
+  std::string operator()(int&&) const { return "&&"; }
+  std::string operator()(const int&&) const { return "const&&"; }
+};
+
+TEST(BindTest, PerfectForwardingOfFreeArgs) {
+  ArgDescribe f;
+  int i;
+  EXPECT_EQ("&", absl::bind_front(f)(static_cast<int&>(i)));
+  EXPECT_EQ("const&", absl::bind_front(f)(static_cast<const int&>(i)));
+  EXPECT_EQ("&&", absl::bind_front(f)(static_cast<int&&>(i)));
+  EXPECT_EQ("const&&", absl::bind_front(f)(static_cast<const int&&>(i)));
+}
+
+struct NonCopyableFunctor {
+  NonCopyableFunctor() = default;
+  NonCopyableFunctor(const NonCopyableFunctor&) = delete;
+  NonCopyableFunctor& operator=(const NonCopyableFunctor&) = delete;
+  const NonCopyableFunctor* operator()() const { return this; }
+};
+
+TEST(BindTest, RefToFunctor) {
+  // It won't copy/move the functor and use the original object.
+  NonCopyableFunctor ncf;
+  auto bound_ncf = absl::bind_front(std::ref(ncf));
+  auto bound_ncf_copy = bound_ncf;
+  EXPECT_EQ(&ncf, bound_ncf_copy());
+}
+
+struct Struct {
+  std::string value;
+};
+
+TEST(BindTest, StoreByCopy) {
+  Struct s = {"hello"};
+  auto f = absl::bind_front(&Struct::value, s);
+  auto g = f;
+  EXPECT_EQ("hello", f());
+  EXPECT_EQ("hello", g());
+  EXPECT_NE(&s.value, &f());
+  EXPECT_NE(&s.value, &g());
+  EXPECT_NE(&g(), &f());
+}
+
+struct NonCopyable {
+  explicit NonCopyable(const std::string& s) : value(s) {}
+  NonCopyable(const NonCopyable&) = delete;
+  NonCopyable& operator=(const NonCopyable&) = delete;
+
+  std::string value;
+};
+
+const std::string& GetNonCopyableValue(const NonCopyable& n) { return n.value; }
+
+TEST(BindTest, StoreByRef) {
+  NonCopyable s("hello");
+  auto f = absl::bind_front(&GetNonCopyableValue, std::ref(s));
+  EXPECT_EQ("hello", f());
+  EXPECT_EQ(&s.value, &f());
+  auto g = std::move(f);  // NOLINT
+  EXPECT_EQ("hello", g());
+  EXPECT_EQ(&s.value, &g());
+  s.value = "goodbye";
+  EXPECT_EQ("goodbye", g());
+}
+
+TEST(BindTest, StoreByCRef) {
+  NonCopyable s("hello");
+  auto f = absl::bind_front(&GetNonCopyableValue, std::cref(s));
+  EXPECT_EQ("hello", f());
+  EXPECT_EQ(&s.value, &f());
+  auto g = std::move(f);  // NOLINT
+  EXPECT_EQ("hello", g());
+  EXPECT_EQ(&s.value, &g());
+  s.value = "goodbye";
+  EXPECT_EQ("goodbye", g());
+}
+
+const std::string& GetNonCopyableValueByWrapper(
+    std::reference_wrapper<NonCopyable> n) {
+  return n.get().value;
+}
+
+TEST(BindTest, StoreByRefInvokeByWrapper) {
+  NonCopyable s("hello");
+  auto f = absl::bind_front(GetNonCopyableValueByWrapper, std::ref(s));
+  EXPECT_EQ("hello", f());
+  EXPECT_EQ(&s.value, &f());
+  auto g = std::move(f);
+  EXPECT_EQ("hello", g());
+  EXPECT_EQ(&s.value, &g());
+  s.value = "goodbye";
+  EXPECT_EQ("goodbye", g());
+}
+
+TEST(BindTest, StoreByPointer) {
+  NonCopyable s("hello");
+  auto f = absl::bind_front(&NonCopyable::value, &s);
+  EXPECT_EQ("hello", f());
+  EXPECT_EQ(&s.value, &f());
+  auto g = std::move(f);
+  EXPECT_EQ("hello", g());
+  EXPECT_EQ(&s.value, &g());
+}
+
+int Sink(std::unique_ptr<int> p) {
+  return *p;
+}
+
+std::unique_ptr<int> Factory(int n) { return absl::make_unique<int>(n); }
+
+TEST(BindTest, NonCopyableArg) {
+  EXPECT_EQ(42, absl::bind_front(Sink)(absl::make_unique<int>(42)));
+  EXPECT_EQ(42, absl::bind_front(Sink, absl::make_unique<int>(42))());
+}
+
+TEST(BindTest, NonCopyableResult) {
+  EXPECT_THAT(absl::bind_front(Factory)(42), ::testing::Pointee(42));
+  EXPECT_THAT(absl::bind_front(Factory, 42)(), ::testing::Pointee(42));
+}
+
+// is_copy_constructible<FalseCopyable<unique_ptr<T>> is true but an attempt to
+// instantiate the copy constructor leads to a compile error. This is similar
+// to how standard containers behave.
+template <class T>
+struct FalseCopyable {
+  FalseCopyable() {}
+  FalseCopyable(const FalseCopyable& other) : m(other.m) {}
+  FalseCopyable(FalseCopyable&& other) : m(std::move(other.m)) {}
+  T m;
+};
+
+int GetMember(FalseCopyable<std::unique_ptr<int>> x) { return *x.m; }
+
+TEST(BindTest, WrappedMoveOnly) {
+  FalseCopyable<std::unique_ptr<int>> x;
+  x.m = absl::make_unique<int>(42);
+  auto f = absl::bind_front(&GetMember, std::move(x));
+  EXPECT_EQ(42, std::move(f)());
+}
+
+int Plus(int a, int b) { return a + b; }
+
+TEST(BindTest, ConstExpr) {
+  constexpr auto f = absl::bind_front(CharAt);
+  EXPECT_EQ(f("ABC", 1), 'B');
+  static constexpr int five = 5;
+  constexpr auto plus5 = absl::bind_front(Plus, five);
+  EXPECT_EQ(plus5(1), 6);
+
+  // There seems to be a bug in MSVC dealing constexpr construction of
+  // char[]. Notice 'plus5' above; 'int' works just fine.
+#if !(defined(_MSC_VER) && _MSC_VER < 1910)
+  static constexpr char data[] = "DEF";
+  constexpr auto g = absl::bind_front(CharAt, data);
+  EXPECT_EQ(g(1), 'E');
+#endif
+}
+
+struct ManglingCall {
+  int operator()(int, double, std::string) const { return 0; }
+};
+
+TEST(BindTest, Mangling) {
+  // We just want to generate a particular instantiation to see its mangling.
+  absl::bind_front(ManglingCall{}, 1, 3.3)("A");
+}
+
+}  // namespace
diff --git a/absl/functional/internal/front_binder.h b/absl/functional/internal/front_binder.h
new file mode 100644
index 00000000..a4d95da4
--- /dev/null
+++ b/absl/functional/internal/front_binder.h
@@ -0,0 +1,95 @@
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Implementation details for `absl::bind_front()`.
+
+#ifndef ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_
+#define ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_
+
+#include <cstddef>
+#include <type_traits>
+#include <utility>
+
+#include "absl/base/internal/invoke.h"
+#include "absl/container/internal/compressed_tuple.h"
+#include "absl/meta/type_traits.h"
+#include "absl/utility/utility.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace functional_internal {
+
+// Invoke the method, expanding the tuple of bound arguments.
+template <class R, class Tuple, size_t... Idx, class... Args>
+R Apply(Tuple&& bound, absl::index_sequence<Idx...>, Args&&... free) {
+  return base_internal::Invoke(
+      absl::forward<Tuple>(bound).template get<Idx>()...,
+      absl::forward<Args>(free)...);
+}
+
+template <class F, class... BoundArgs>
+class FrontBinder {
+  using BoundArgsT = absl::container_internal::CompressedTuple<F, BoundArgs...>;
+  using Idx = absl::make_index_sequence<sizeof...(BoundArgs) + 1>;
+
+  BoundArgsT bound_args_;
+
+ public:
+  template <class... Ts>
+  constexpr explicit FrontBinder(absl::in_place_t, Ts&&... ts)
+      : bound_args_(absl::forward<Ts>(ts)...) {}
+
+  template <class... FreeArgs,
+            class R = base_internal::InvokeT<F&, BoundArgs&..., FreeArgs&&...>>
+  R operator()(FreeArgs&&... free_args) & {
+    return functional_internal::Apply<R>(bound_args_, Idx(),
+                                         absl::forward<FreeArgs>(free_args)...);
+  }
+
+  template <class... FreeArgs,
+            class R = base_internal::InvokeT<const F&, const BoundArgs&...,
+                                             FreeArgs&&...>>
+  R operator()(FreeArgs&&... free_args) const& {
+    return functional_internal::Apply<R>(bound_args_, Idx(),
+                                         absl::forward<FreeArgs>(free_args)...);
+  }
+
+  template <class... FreeArgs, class R = base_internal::InvokeT<
+                                   F&&, BoundArgs&&..., FreeArgs&&...>>
+  R operator()(FreeArgs&&... free_args) && {
+    // This overload is called when *this is an rvalue. If some of the bound
+    // arguments are stored by value or rvalue reference, we move them.
+    return functional_internal::Apply<R>(absl::move(bound_args_), Idx(),
+                                         absl::forward<FreeArgs>(free_args)...);
+  }
+
+  template <class... FreeArgs,
+            class R = base_internal::InvokeT<const F&&, const BoundArgs&&...,
+                                             FreeArgs&&...>>
+  R operator()(FreeArgs&&... free_args) const&& {
+    // This overload is called when *this is an rvalue. If some of the bound
+    // arguments are stored by value or rvalue reference, we move them.
+    return functional_internal::Apply<R>(absl::move(bound_args_), Idx(),
+                                         absl::forward<FreeArgs>(free_args)...);
+  }
+};
+
+template <class F, class... BoundArgs>
+using bind_front_t = FrontBinder<decay_t<F>, absl::decay_t<BoundArgs>...>;
+
+}  // namespace functional_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_
diff --git a/absl/random/uniform_real_distribution_test.cc b/absl/random/uniform_real_distribution_test.cc
index 9f14d1c5..a56374a6 100644
--- a/absl/random/uniform_real_distribution_test.cc
+++ b/absl/random/uniform_real_distribution_test.cc
@@ -161,6 +161,10 @@ TYPED_TEST(UniformRealDistributionTest, ParamSerializeTest) {
   }
 }
 
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable:4756)  // Constant arithmetic overflow.
+#endif
 TYPED_TEST(UniformRealDistributionTest, ViolatesPreconditionsDeathTest) {
 #if GTEST_HAS_DEATH_TEST
   // Hi < Lo
@@ -195,6 +199,9 @@ TYPED_TEST(UniformRealDistributionTest, ViolatesPreconditionsDeathTest) {
   }
 #endif  // NDEBUG
 }
+#ifdef _MSC_VER
+#pragma warning(pop)  // warning(disable:4756)
+#endif
 
 TYPED_TEST(UniformRealDistributionTest, TestMoments) {
   constexpr int kSize = 1000000;
diff --git a/absl/time/internal/cctz/BUILD.bazel b/absl/time/internal/cctz/BUILD.bazel
index 9fceffe2..5ad0f036 100644
--- a/absl/time/internal/cctz/BUILD.bazel
+++ b/absl/time/internal/cctz/BUILD.bazel
@@ -42,6 +42,7 @@ cc_library(
     ],
     textual_hdrs = ["include/cctz/civil_time_detail.h"],
     visibility = ["//visibility:public"],
+    deps = ["//absl/base:config"],
 )
 
 cc_library(
@@ -78,7 +79,10 @@ cc_library(
         "//conditions:default": [],
     }),
     visibility = ["//visibility:public"],
-    deps = [":civil_time"],
+    deps = [
+        ":civil_time",
+        "//absl/base:config",
+    ],
 )
 
 ### tests
@@ -89,6 +93,7 @@ cc_test(
     srcs = ["src/civil_time_test.cc"],
     deps = [
         ":civil_time",
+        "//absl/base:config",
         "@com_google_googletest//:gtest_main",
     ],
 )
@@ -106,6 +111,7 @@ cc_test(
     deps = [
         ":civil_time",
         ":time_zone",
+        "//absl/base:config",
         "@com_google_googletest//:gtest_main",
     ],
 )
@@ -124,6 +130,7 @@ cc_test(
     deps = [
         ":civil_time",
         ":time_zone",
+        "//absl/base:config",
         "@com_google_googletest//:gtest_main",
     ],
 )
@@ -144,6 +151,7 @@ cc_test(
     deps = [
         ":civil_time",
         ":time_zone",
+        "//absl/base:config",
         "@com_github_google_benchmark//:benchmark_main",
     ],
 )
diff --git a/absl/time/internal/cctz/include/cctz/civil_time.h b/absl/time/internal/cctz/include/cctz/civil_time.h
index 19b311bb..d47ff86f 100644
--- a/absl/time/internal/cctz/include/cctz/civil_time.h
+++ b/absl/time/internal/cctz/include/cctz/civil_time.h
@@ -15,9 +15,11 @@
 #ifndef ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_H_
 #define ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_H_
 
+#include "absl/base/config.h"
 #include "absl/time/internal/cctz/include/cctz/civil_time_detail.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -324,6 +326,7 @@ using detail::get_yearday;
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_H_
diff --git a/absl/time/internal/cctz/include/cctz/civil_time_detail.h b/absl/time/internal/cctz/include/cctz/civil_time_detail.h
index 433078a7..4cde96f1 100644
--- a/absl/time/internal/cctz/include/cctz/civil_time_detail.h
+++ b/absl/time/internal/cctz/include/cctz/civil_time_detail.h
@@ -20,6 +20,8 @@
 #include <ostream>
 #include <type_traits>
 
+#include "absl/base/config.h"
+
 // Disable constexpr support unless we are in C++14 mode.
 #if __cpp_constexpr >= 201304 || (defined(_MSC_VER) && _MSC_VER >= 1910)
 #define CONSTEXPR_D constexpr  // data
@@ -32,6 +34,7 @@
 #endif
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -53,8 +56,8 @@ using second_t = std::int_fast8_t;  // [0:59]
 
 // Normalized civil-time fields: Y-M-D HH:MM:SS.
 struct fields {
-  CONSTEXPR_M fields(year_t year, month_t month, day_t day,
-                     hour_t hour, minute_t minute, second_t second)
+  CONSTEXPR_M fields(year_t year, month_t month, day_t day, hour_t hour,
+                     minute_t minute, second_t second)
       : y(year), m(month), d(day), hh(hour), mm(minute), ss(second) {}
   std::int_least64_t y;
   std::int_least8_t m;
@@ -101,8 +104,8 @@ CONSTEXPR_F int days_per_month(year_t y, month_t m) noexcept {
   return k_days_per_month[m] + (m == 2 && is_leap_year(y));
 }
 
-CONSTEXPR_F fields n_day(year_t y, month_t m, diff_t d, diff_t cd,
-                         hour_t hh, minute_t mm, second_t ss) noexcept {
+CONSTEXPR_F fields n_day(year_t y, month_t m, diff_t d, diff_t cd, hour_t hh,
+                         minute_t mm, second_t ss) noexcept {
   y += (cd / 146097) * 400;
   cd %= 146097;
   if (cd < 0) {
@@ -152,8 +155,8 @@ CONSTEXPR_F fields n_day(year_t y, month_t m, diff_t d, diff_t cd,
   }
   return fields(y, m, static_cast<day_t>(d), hh, mm, ss);
 }
-CONSTEXPR_F fields n_mon(year_t y, diff_t m, diff_t d, diff_t cd,
-                         hour_t hh, minute_t mm, second_t ss) noexcept {
+CONSTEXPR_F fields n_mon(year_t y, diff_t m, diff_t d, diff_t cd, hour_t hh,
+                         minute_t mm, second_t ss) noexcept {
   if (m != 12) {
     y += m / 12;
     m %= 12;
@@ -164,8 +167,8 @@ CONSTEXPR_F fields n_mon(year_t y, diff_t m, diff_t d, diff_t cd,
   }
   return n_day(y, static_cast<month_t>(m), d, cd, hh, mm, ss);
 }
-CONSTEXPR_F fields n_hour(year_t y, diff_t m, diff_t d, diff_t cd,
-                          diff_t hh, minute_t mm, second_t ss) noexcept {
+CONSTEXPR_F fields n_hour(year_t y, diff_t m, diff_t d, diff_t cd, diff_t hh,
+                          minute_t mm, second_t ss) noexcept {
   cd += hh / 24;
   hh %= 24;
   if (hh < 0) {
@@ -264,8 +267,8 @@ CONSTEXPR_F diff_t ymd_ord(year_t y, month_t m, day_t d) noexcept {
 // yet the difference between two such extreme values may actually be
 // small, so we take a little care to avoid overflow when possible by
 // exploiting the 146097-day cycle.
-CONSTEXPR_F diff_t day_difference(year_t y1, month_t m1, day_t d1,
-                                  year_t y2, month_t m2, day_t d2) noexcept {
+CONSTEXPR_F diff_t day_difference(year_t y1, month_t m1, day_t d1, year_t y2,
+                                  month_t m2, day_t d2) noexcept {
   const diff_t a_c4_off = y1 % 400;
   const diff_t b_c4_off = y2 % 400;
   diff_t c4_diff = (y1 - a_c4_off) - (y2 - b_c4_off);
@@ -305,9 +308,7 @@ CONSTEXPR_F diff_t difference(second_tag, fields f1, fields f2) noexcept {
 ////////////////////////////////////////////////////////////////////////
 
 // Aligns the (normalized) fields struct to the indicated field.
-CONSTEXPR_F fields align(second_tag, fields f) noexcept {
-  return f;
-}
+CONSTEXPR_F fields align(second_tag, fields f) noexcept { return f; }
 CONSTEXPR_F fields align(minute_tag, fields f) noexcept {
   return fields{f.y, f.m, f.d, f.hh, f.mm, 0};
 }
@@ -386,11 +387,11 @@ class civil_time {
       : civil_time(ct.f_) {}
 
   // Factories for the maximum/minimum representable civil_time.
-  static CONSTEXPR_F civil_time (max)() {
+  static CONSTEXPR_F civil_time(max)() {
     const auto max_year = (std::numeric_limits<std::int_least64_t>::max)();
     return civil_time(max_year, 12, 31, 23, 59, 59);
   }
-  static CONSTEXPR_F civil_time (min)() {
+  static CONSTEXPR_F civil_time(min)() {
     const auto min_year = (std::numeric_limits<std::int_least64_t>::min)();
     return civil_time(min_year, 1, 1, 0, 0, 0);
   }
@@ -416,17 +417,13 @@ class civil_time {
     }
     return *this;
   }
-  CONSTEXPR_M civil_time& operator++() noexcept {
-    return *this += 1;
-  }
+  CONSTEXPR_M civil_time& operator++() noexcept { return *this += 1; }
   CONSTEXPR_M civil_time operator++(int) noexcept {
     const civil_time a = *this;
     ++*this;
     return a;
   }
-  CONSTEXPR_M civil_time& operator--() noexcept {
-    return *this -= 1;
-  }
+  CONSTEXPR_M civil_time& operator--() noexcept { return *this -= 1; }
   CONSTEXPR_M civil_time operator--(int) noexcept {
     const civil_time a = *this;
     --*this;
@@ -483,17 +480,17 @@ using civil_second = civil_time<second_tag>;
 template <typename T1, typename T2>
 CONSTEXPR_F bool operator<(const civil_time<T1>& lhs,
                            const civil_time<T2>& rhs) noexcept {
-  return (lhs.year() < rhs.year() ||
-          (lhs.year() == rhs.year() &&
-           (lhs.month() < rhs.month() ||
-            (lhs.month() == rhs.month() &&
-             (lhs.day() < rhs.day() ||
-              (lhs.day() == rhs.day() &&
-               (lhs.hour() < rhs.hour() ||
-                (lhs.hour() == rhs.hour() &&
-                 (lhs.minute() < rhs.minute() ||
-                  (lhs.minute() == rhs.minute() &&
-                   (lhs.second() < rhs.second())))))))))));
+  return (
+      lhs.year() < rhs.year() ||
+      (lhs.year() == rhs.year() &&
+       (lhs.month() < rhs.month() ||
+        (lhs.month() == rhs.month() &&
+         (lhs.day() < rhs.day() || (lhs.day() == rhs.day() &&
+                                    (lhs.hour() < rhs.hour() ||
+                                     (lhs.hour() == rhs.hour() &&
+                                      (lhs.minute() < rhs.minute() ||
+                                       (lhs.minute() == rhs.minute() &&
+                                        (lhs.second() < rhs.second())))))))))));
 }
 template <typename T1, typename T2>
 CONSTEXPR_F bool operator<=(const civil_time<T1>& lhs,
@@ -615,6 +612,7 @@ std::ostream& operator<<(std::ostream& os, weekday wd);
 }  // namespace detail
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #undef CONSTEXPR_M
diff --git a/absl/time/internal/cctz/include/cctz/time_zone.h b/absl/time/internal/cctz/include/cctz/time_zone.h
index ef6c4ba1..d05147a1 100644
--- a/absl/time/internal/cctz/include/cctz/time_zone.h
+++ b/absl/time/internal/cctz/include/cctz/time_zone.h
@@ -25,9 +25,11 @@
 #include <string>
 #include <utility>
 
+#include "absl/base/config.h"
 #include "absl/time/internal/cctz/include/cctz/civil_time.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -39,8 +41,8 @@ using sys_seconds = seconds;  // Deprecated.  Use cctz::seconds instead.
 
 namespace detail {
 template <typename D>
-inline std::pair<time_point<seconds>, D>
-split_seconds(const time_point<D>& tp) {
+inline std::pair<time_point<seconds>, D> split_seconds(
+    const time_point<D>& tp) {
   auto sec = std::chrono::time_point_cast<seconds>(tp);
   auto sub = tp - sec;
   if (sub.count() < 0) {
@@ -49,8 +51,8 @@ split_seconds(const time_point<D>& tp) {
   }
   return {sec, std::chrono::duration_cast<D>(sub)};
 }
-inline std::pair<time_point<seconds>, seconds>
-split_seconds(const time_point<seconds>& tp) {
+inline std::pair<time_point<seconds>, seconds> split_seconds(
+    const time_point<seconds>& tp) {
   return {tp, seconds::zero()};
 }
 }  // namespace detail
@@ -194,15 +196,13 @@ class time_zone {
   bool next_transition(const time_point<seconds>& tp,
                        civil_transition* trans) const;
   template <typename D>
-  bool next_transition(const time_point<D>& tp,
-                       civil_transition* trans) const {
+  bool next_transition(const time_point<D>& tp, civil_transition* trans) const {
     return next_transition(detail::split_seconds(tp).first, trans);
   }
   bool prev_transition(const time_point<seconds>& tp,
                        civil_transition* trans) const;
   template <typename D>
-  bool prev_transition(const time_point<D>& tp,
-                       civil_transition* trans) const {
+  bool prev_transition(const time_point<D>& tp, civil_transition* trans) const {
     return prev_transition(detail::split_seconds(tp).first, trans);
   }
 
@@ -220,9 +220,7 @@ class time_zone {
   friend bool operator==(time_zone lhs, time_zone rhs) {
     return &lhs.effective_impl() == &rhs.effective_impl();
   }
-  friend bool operator!=(time_zone lhs, time_zone rhs) {
-    return !(lhs == rhs);
-  }
+  friend bool operator!=(time_zone lhs, time_zone rhs) { return !(lhs == rhs); }
 
   template <typename H>
   friend H AbslHashValue(H h, time_zone tz) {
@@ -380,6 +378,7 @@ inline bool parse(const std::string& fmt, const std::string& input,
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_H_
diff --git a/absl/time/internal/cctz/include/cctz/zone_info_source.h b/absl/time/internal/cctz/include/cctz/zone_info_source.h
index 2b898d18..912b44ba 100644
--- a/absl/time/internal/cctz/include/cctz/zone_info_source.h
+++ b/absl/time/internal/cctz/include/cctz/zone_info_source.h
@@ -20,7 +20,10 @@
 #include <memory>
 #include <string>
 
+#include "absl/base/config.h"
+
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -30,7 +33,7 @@ class ZoneInfoSource {
   virtual ~ZoneInfoSource();
 
   virtual std::size_t Read(void* ptr, std::size_t size) = 0;  // like fread()
-  virtual int Skip(std::size_t offset) = 0;  // like fseek()
+  virtual int Skip(std::size_t offset) = 0;                   // like fseek()
 
   // Until the zoneinfo data supports versioning information, we provide
   // a way for a ZoneInfoSource to indicate it out-of-band.  The default
@@ -40,9 +43,11 @@ class ZoneInfoSource {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz_extension {
 
@@ -52,8 +57,8 @@ namespace cctz_extension {
 using ZoneInfoSourceFactory =
     std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource> (*)(
         const std::string&,
-        const std::function<std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource>(
-            const std::string&)>&);
+        const std::function<std::unique_ptr<
+            absl::time_internal::cctz::ZoneInfoSource>(const std::string&)>&);
 
 // The user can control the mapping of zone names to zoneinfo data by
 // providing a definition for cctz_extension::zone_info_source_factory.
@@ -91,6 +96,7 @@ extern ZoneInfoSourceFactory zone_info_source_factory;
 
 }  // namespace cctz_extension
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_TIME_INTERNAL_CCTZ_ZONE_INFO_SOURCE_H_
diff --git a/absl/time/internal/cctz/src/cctz_benchmark.cc b/absl/time/internal/cctz/src/cctz_benchmark.cc
index a40f504e..d30a644e 100644
--- a/absl/time/internal/cctz/src/cctz_benchmark.cc
+++ b/absl/time/internal/cctz/src/cctz_benchmark.cc
@@ -105,601 +105,599 @@ const char RFC1123_no_wday[] = "%d %b %Y %H:%M:%S %z";
 
 // A list of known time-zone names.
 // TODO: Refactor with src/time_zone_lookup_test.cc.
-const char* const kTimeZoneNames[] = {
-  "Africa/Abidjan",
-  "Africa/Accra",
-  "Africa/Addis_Ababa",
-  "Africa/Algiers",
-  "Africa/Asmara",
-  "Africa/Asmera",
-  "Africa/Bamako",
-  "Africa/Bangui",
-  "Africa/Banjul",
-  "Africa/Bissau",
-  "Africa/Blantyre",
-  "Africa/Brazzaville",
-  "Africa/Bujumbura",
-  "Africa/Cairo",
-  "Africa/Casablanca",
-  "Africa/Ceuta",
-  "Africa/Conakry",
-  "Africa/Dakar",
-  "Africa/Dar_es_Salaam",
-  "Africa/Djibouti",
-  "Africa/Douala",
-  "Africa/El_Aaiun",
-  "Africa/Freetown",
-  "Africa/Gaborone",
-  "Africa/Harare",
-  "Africa/Johannesburg",
-  "Africa/Juba",
-  "Africa/Kampala",
-  "Africa/Khartoum",
-  "Africa/Kigali",
-  "Africa/Kinshasa",
-  "Africa/Lagos",
-  "Africa/Libreville",
-  "Africa/Lome",
-  "Africa/Luanda",
-  "Africa/Lubumbashi",
-  "Africa/Lusaka",
-  "Africa/Malabo",
-  "Africa/Maputo",
-  "Africa/Maseru",
-  "Africa/Mbabane",
-  "Africa/Mogadishu",
-  "Africa/Monrovia",
-  "Africa/Nairobi",
-  "Africa/Ndjamena",
-  "Africa/Niamey",
-  "Africa/Nouakchott",
-  "Africa/Ouagadougou",
-  "Africa/Porto-Novo",
-  "Africa/Sao_Tome",
-  "Africa/Timbuktu",
-  "Africa/Tripoli",
-  "Africa/Tunis",
-  "Africa/Windhoek",
-  "America/Adak",
-  "America/Anchorage",
-  "America/Anguilla",
-  "America/Antigua",
-  "America/Araguaina",
-  "America/Argentina/Buenos_Aires",
-  "America/Argentina/Catamarca",
-  "America/Argentina/ComodRivadavia",
-  "America/Argentina/Cordoba",
-  "America/Argentina/Jujuy",
-  "America/Argentina/La_Rioja",
-  "America/Argentina/Mendoza",
-  "America/Argentina/Rio_Gallegos",
-  "America/Argentina/Salta",
-  "America/Argentina/San_Juan",
-  "America/Argentina/San_Luis",
-  "America/Argentina/Tucuman",
-  "America/Argentina/Ushuaia",
-  "America/Aruba",
-  "America/Asuncion",
-  "America/Atikokan",
-  "America/Atka",
-  "America/Bahia",
-  "America/Bahia_Banderas",
-  "America/Barbados",
-  "America/Belem",
-  "America/Belize",
-  "America/Blanc-Sablon",
-  "America/Boa_Vista",
-  "America/Bogota",
-  "America/Boise",
-  "America/Buenos_Aires",
-  "America/Cambridge_Bay",
-  "America/Campo_Grande",
-  "America/Cancun",
-  "America/Caracas",
-  "America/Catamarca",
-  "America/Cayenne",
-  "America/Cayman",
-  "America/Chicago",
-  "America/Chihuahua",
-  "America/Coral_Harbour",
-  "America/Cordoba",
-  "America/Costa_Rica",
-  "America/Creston",
-  "America/Cuiaba",
-  "America/Curacao",
-  "America/Danmarkshavn",
-  "America/Dawson",
-  "America/Dawson_Creek",
-  "America/Denver",
-  "America/Detroit",
-  "America/Dominica",
-  "America/Edmonton",
-  "America/Eirunepe",
-  "America/El_Salvador",
-  "America/Ensenada",
-  "America/Fort_Nelson",
-  "America/Fort_Wayne",
-  "America/Fortaleza",
-  "America/Glace_Bay",
-  "America/Godthab",
-  "America/Goose_Bay",
-  "America/Grand_Turk",
-  "America/Grenada",
-  "America/Guadeloupe",
-  "America/Guatemala",
-  "America/Guayaquil",
-  "America/Guyana",
-  "America/Halifax",
-  "America/Havana",
-  "America/Hermosillo",
-  "America/Indiana/Indianapolis",
-  "America/Indiana/Knox",
-  "America/Indiana/Marengo",
-  "America/Indiana/Petersburg",
-  "America/Indiana/Tell_City",
-  "America/Indiana/Vevay",
-  "America/Indiana/Vincennes",
-  "America/Indiana/Winamac",
-  "America/Indianapolis",
-  "America/Inuvik",
-  "America/Iqaluit",
-  "America/Jamaica",
-  "America/Jujuy",
-  "America/Juneau",
-  "America/Kentucky/Louisville",
-  "America/Kentucky/Monticello",
-  "America/Knox_IN",
-  "America/Kralendijk",
-  "America/La_Paz",
-  "America/Lima",
-  "America/Los_Angeles",
-  "America/Louisville",
-  "America/Lower_Princes",
-  "America/Maceio",
-  "America/Managua",
-  "America/Manaus",
-  "America/Marigot",
-  "America/Martinique",
-  "America/Matamoros",
-  "America/Mazatlan",
-  "America/Mendoza",
-  "America/Menominee",
-  "America/Merida",
-  "America/Metlakatla",
-  "America/Mexico_City",
-  "America/Miquelon",
-  "America/Moncton",
-  "America/Monterrey",
-  "America/Montevideo",
-  "America/Montreal",
-  "America/Montserrat",
-  "America/Nassau",
-  "America/New_York",
-  "America/Nipigon",
-  "America/Nome",
-  "America/Noronha",
-  "America/North_Dakota/Beulah",
-  "America/North_Dakota/Center",
-  "America/North_Dakota/New_Salem",
-  "America/Ojinaga",
-  "America/Panama",
-  "America/Pangnirtung",
-  "America/Paramaribo",
-  "America/Phoenix",
-  "America/Port-au-Prince",
-  "America/Port_of_Spain",
-  "America/Porto_Acre",
-  "America/Porto_Velho",
-  "America/Puerto_Rico",
-  "America/Punta_Arenas",
-  "America/Rainy_River",
-  "America/Rankin_Inlet",
-  "America/Recife",
-  "America/Regina",
-  "America/Resolute",
-  "America/Rio_Branco",
-  "America/Rosario",
-  "America/Santa_Isabel",
-  "America/Santarem",
-  "America/Santiago",
-  "America/Santo_Domingo",
-  "America/Sao_Paulo",
-  "America/Scoresbysund",
-  "America/Shiprock",
-  "America/Sitka",
-  "America/St_Barthelemy",
-  "America/St_Johns",
-  "America/St_Kitts",
-  "America/St_Lucia",
-  "America/St_Thomas",
-  "America/St_Vincent",
-  "America/Swift_Current",
-  "America/Tegucigalpa",
-  "America/Thule",
-  "America/Thunder_Bay",
-  "America/Tijuana",
-  "America/Toronto",
-  "America/Tortola",
-  "America/Vancouver",
-  "America/Virgin",
-  "America/Whitehorse",
-  "America/Winnipeg",
-  "America/Yakutat",
-  "America/Yellowknife",
-  "Antarctica/Casey",
-  "Antarctica/Davis",
-  "Antarctica/DumontDUrville",
-  "Antarctica/Macquarie",
-  "Antarctica/Mawson",
-  "Antarctica/McMurdo",
-  "Antarctica/Palmer",
-  "Antarctica/Rothera",
-  "Antarctica/South_Pole",
-  "Antarctica/Syowa",
-  "Antarctica/Troll",
-  "Antarctica/Vostok",
-  "Arctic/Longyearbyen",
-  "Asia/Aden",
-  "Asia/Almaty",
-  "Asia/Amman",
-  "Asia/Anadyr",
-  "Asia/Aqtau",
-  "Asia/Aqtobe",
-  "Asia/Ashgabat",
-  "Asia/Ashkhabad",
-  "Asia/Atyrau",
-  "Asia/Baghdad",
-  "Asia/Bahrain",
-  "Asia/Baku",
-  "Asia/Bangkok",
-  "Asia/Barnaul",
-  "Asia/Beirut",
-  "Asia/Bishkek",
-  "Asia/Brunei",
-  "Asia/Calcutta",
-  "Asia/Chita",
-  "Asia/Choibalsan",
-  "Asia/Chongqing",
-  "Asia/Chungking",
-  "Asia/Colombo",
-  "Asia/Dacca",
-  "Asia/Damascus",
-  "Asia/Dhaka",
-  "Asia/Dili",
-  "Asia/Dubai",
-  "Asia/Dushanbe",
-  "Asia/Famagusta",
-  "Asia/Gaza",
-  "Asia/Harbin",
-  "Asia/Hebron",
-  "Asia/Ho_Chi_Minh",
-  "Asia/Hong_Kong",
-  "Asia/Hovd",
-  "Asia/Irkutsk",
-  "Asia/Istanbul",
-  "Asia/Jakarta",
-  "Asia/Jayapura",
-  "Asia/Jerusalem",
-  "Asia/Kabul",
-  "Asia/Kamchatka",
-  "Asia/Karachi",
-  "Asia/Kashgar",
-  "Asia/Kathmandu",
-  "Asia/Katmandu",
-  "Asia/Khandyga",
-  "Asia/Kolkata",
-  "Asia/Krasnoyarsk",
-  "Asia/Kuala_Lumpur",
-  "Asia/Kuching",
-  "Asia/Kuwait",
-  "Asia/Macao",
-  "Asia/Macau",
-  "Asia/Magadan",
-  "Asia/Makassar",
-  "Asia/Manila",
-  "Asia/Muscat",
-  "Asia/Nicosia",
-  "Asia/Novokuznetsk",
-  "Asia/Novosibirsk",
-  "Asia/Omsk",
-  "Asia/Oral",
-  "Asia/Phnom_Penh",
-  "Asia/Pontianak",
-  "Asia/Pyongyang",
-  "Asia/Qatar",
-  "Asia/Qostanay",
-  "Asia/Qyzylorda",
-  "Asia/Rangoon",
-  "Asia/Riyadh",
-  "Asia/Saigon",
-  "Asia/Sakhalin",
-  "Asia/Samarkand",
-  "Asia/Seoul",
-  "Asia/Shanghai",
-  "Asia/Singapore",
-  "Asia/Srednekolymsk",
-  "Asia/Taipei",
-  "Asia/Tashkent",
-  "Asia/Tbilisi",
-  "Asia/Tehran",
-  "Asia/Tel_Aviv",
-  "Asia/Thimbu",
-  "Asia/Thimphu",
-  "Asia/Tokyo",
-  "Asia/Tomsk",
-  "Asia/Ujung_Pandang",
-  "Asia/Ulaanbaatar",
-  "Asia/Ulan_Bator",
-  "Asia/Urumqi",
-  "Asia/Ust-Nera",
-  "Asia/Vientiane",
-  "Asia/Vladivostok",
-  "Asia/Yakutsk",
-  "Asia/Yangon",
-  "Asia/Yekaterinburg",
-  "Asia/Yerevan",
-  "Atlantic/Azores",
-  "Atlantic/Bermuda",
-  "Atlantic/Canary",
-  "Atlantic/Cape_Verde",
-  "Atlantic/Faeroe",
-  "Atlantic/Faroe",
-  "Atlantic/Jan_Mayen",
-  "Atlantic/Madeira",
-  "Atlantic/Reykjavik",
-  "Atlantic/South_Georgia",
-  "Atlantic/St_Helena",
-  "Atlantic/Stanley",
-  "Australia/ACT",
-  "Australia/Adelaide",
-  "Australia/Brisbane",
-  "Australia/Broken_Hill",
-  "Australia/Canberra",
-  "Australia/Currie",
-  "Australia/Darwin",
-  "Australia/Eucla",
-  "Australia/Hobart",
-  "Australia/LHI",
-  "Australia/Lindeman",
-  "Australia/Lord_Howe",
-  "Australia/Melbourne",
-  "Australia/NSW",
-  "Australia/North",
-  "Australia/Perth",
-  "Australia/Queensland",
-  "Australia/South",
-  "Australia/Sydney",
-  "Australia/Tasmania",
-  "Australia/Victoria",
-  "Australia/West",
-  "Australia/Yancowinna",
-  "Brazil/Acre",
-  "Brazil/DeNoronha",
-  "Brazil/East",
-  "Brazil/West",
-  "CET",
-  "CST6CDT",
-  "Canada/Atlantic",
-  "Canada/Central",
-  "Canada/Eastern",
-  "Canada/Mountain",
-  "Canada/Newfoundland",
-  "Canada/Pacific",
-  "Canada/Saskatchewan",
-  "Canada/Yukon",
-  "Chile/Continental",
-  "Chile/EasterIsland",
-  "Cuba",
-  "EET",
-  "EST",
-  "EST5EDT",
-  "Egypt",
-  "Eire",
-  "Etc/GMT",
-  "Etc/GMT+0",
-  "Etc/GMT+1",
-  "Etc/GMT+10",
-  "Etc/GMT+11",
-  "Etc/GMT+12",
-  "Etc/GMT+2",
-  "Etc/GMT+3",
-  "Etc/GMT+4",
-  "Etc/GMT+5",
-  "Etc/GMT+6",
-  "Etc/GMT+7",
-  "Etc/GMT+8",
-  "Etc/GMT+9",
-  "Etc/GMT-0",
-  "Etc/GMT-1",
-  "Etc/GMT-10",
-  "Etc/GMT-11",
-  "Etc/GMT-12",
-  "Etc/GMT-13",
-  "Etc/GMT-14",
-  "Etc/GMT-2",
-  "Etc/GMT-3",
-  "Etc/GMT-4",
-  "Etc/GMT-5",
-  "Etc/GMT-6",
-  "Etc/GMT-7",
-  "Etc/GMT-8",
-  "Etc/GMT-9",
-  "Etc/GMT0",
-  "Etc/Greenwich",
-  "Etc/UCT",
-  "Etc/UTC",
-  "Etc/Universal",
-  "Etc/Zulu",
-  "Europe/Amsterdam",
-  "Europe/Andorra",
-  "Europe/Astrakhan",
-  "Europe/Athens",
-  "Europe/Belfast",
-  "Europe/Belgrade",
-  "Europe/Berlin",
-  "Europe/Bratislava",
-  "Europe/Brussels",
-  "Europe/Bucharest",
-  "Europe/Budapest",
-  "Europe/Busingen",
-  "Europe/Chisinau",
-  "Europe/Copenhagen",
-  "Europe/Dublin",
-  "Europe/Gibraltar",
-  "Europe/Guernsey",
-  "Europe/Helsinki",
-  "Europe/Isle_of_Man",
-  "Europe/Istanbul",
-  "Europe/Jersey",
-  "Europe/Kaliningrad",
-  "Europe/Kiev",
-  "Europe/Kirov",
-  "Europe/Lisbon",
-  "Europe/Ljubljana",
-  "Europe/London",
-  "Europe/Luxembourg",
-  "Europe/Madrid",
-  "Europe/Malta",
-  "Europe/Mariehamn",
-  "Europe/Minsk",
-  "Europe/Monaco",
-  "Europe/Moscow",
-  "Europe/Nicosia",
-  "Europe/Oslo",
-  "Europe/Paris",
-  "Europe/Podgorica",
-  "Europe/Prague",
-  "Europe/Riga",
-  "Europe/Rome",
-  "Europe/Samara",
-  "Europe/San_Marino",
-  "Europe/Sarajevo",
-  "Europe/Saratov",
-  "Europe/Simferopol",
-  "Europe/Skopje",
-  "Europe/Sofia",
-  "Europe/Stockholm",
-  "Europe/Tallinn",
-  "Europe/Tirane",
-  "Europe/Tiraspol",
-  "Europe/Ulyanovsk",
-  "Europe/Uzhgorod",
-  "Europe/Vaduz",
-  "Europe/Vatican",
-  "Europe/Vienna",
-  "Europe/Vilnius",
-  "Europe/Volgograd",
-  "Europe/Warsaw",
-  "Europe/Zagreb",
-  "Europe/Zaporozhye",
-  "Europe/Zurich",
-  "GB",
-  "GB-Eire",
-  "GMT",
-  "GMT+0",
-  "GMT-0",
-  "GMT0",
-  "Greenwich",
-  "HST",
-  "Hongkong",
-  "Iceland",
-  "Indian/Antananarivo",
-  "Indian/Chagos",
-  "Indian/Christmas",
-  "Indian/Cocos",
-  "Indian/Comoro",
-  "Indian/Kerguelen",
-  "Indian/Mahe",
-  "Indian/Maldives",
-  "Indian/Mauritius",
-  "Indian/Mayotte",
-  "Indian/Reunion",
-  "Iran",
-  "Israel",
-  "Jamaica",
-  "Japan",
-  "Kwajalein",
-  "Libya",
-  "MET",
-  "MST",
-  "MST7MDT",
-  "Mexico/BajaNorte",
-  "Mexico/BajaSur",
-  "Mexico/General",
-  "NZ",
-  "NZ-CHAT",
-  "Navajo",
-  "PRC",
-  "PST8PDT",
-  "Pacific/Apia",
-  "Pacific/Auckland",
-  "Pacific/Bougainville",
-  "Pacific/Chatham",
-  "Pacific/Chuuk",
-  "Pacific/Easter",
-  "Pacific/Efate",
-  "Pacific/Enderbury",
-  "Pacific/Fakaofo",
-  "Pacific/Fiji",
-  "Pacific/Funafuti",
-  "Pacific/Galapagos",
-  "Pacific/Gambier",
-  "Pacific/Guadalcanal",
-  "Pacific/Guam",
-  "Pacific/Honolulu",
-  "Pacific/Johnston",
-  "Pacific/Kiritimati",
-  "Pacific/Kosrae",
-  "Pacific/Kwajalein",
-  "Pacific/Majuro",
-  "Pacific/Marquesas",
-  "Pacific/Midway",
-  "Pacific/Nauru",
-  "Pacific/Niue",
-  "Pacific/Norfolk",
-  "Pacific/Noumea",
-  "Pacific/Pago_Pago",
-  "Pacific/Palau",
-  "Pacific/Pitcairn",
-  "Pacific/Pohnpei",
-  "Pacific/Ponape",
-  "Pacific/Port_Moresby",
-  "Pacific/Rarotonga",
-  "Pacific/Saipan",
-  "Pacific/Samoa",
-  "Pacific/Tahiti",
-  "Pacific/Tarawa",
-  "Pacific/Tongatapu",
-  "Pacific/Truk",
-  "Pacific/Wake",
-  "Pacific/Wallis",
-  "Pacific/Yap",
-  "Poland",
-  "Portugal",
-  "ROC",
-  "ROK",
-  "Singapore",
-  "Turkey",
-  "UCT",
-  "US/Alaska",
-  "US/Aleutian",
-  "US/Arizona",
-  "US/Central",
-  "US/East-Indiana",
-  "US/Eastern",
-  "US/Hawaii",
-  "US/Indiana-Starke",
-  "US/Michigan",
-  "US/Mountain",
-  "US/Pacific",
-  "US/Samoa",
-  "UTC",
-  "Universal",
-  "W-SU",
-  "WET",
-  "Zulu",
-  nullptr
-};
+const char* const kTimeZoneNames[] = {"Africa/Abidjan",
+                                      "Africa/Accra",
+                                      "Africa/Addis_Ababa",
+                                      "Africa/Algiers",
+                                      "Africa/Asmara",
+                                      "Africa/Asmera",
+                                      "Africa/Bamako",
+                                      "Africa/Bangui",
+                                      "Africa/Banjul",
+                                      "Africa/Bissau",
+                                      "Africa/Blantyre",
+                                      "Africa/Brazzaville",
+                                      "Africa/Bujumbura",
+                                      "Africa/Cairo",
+                                      "Africa/Casablanca",
+                                      "Africa/Ceuta",
+                                      "Africa/Conakry",
+                                      "Africa/Dakar",
+                                      "Africa/Dar_es_Salaam",
+                                      "Africa/Djibouti",
+                                      "Africa/Douala",
+                                      "Africa/El_Aaiun",
+                                      "Africa/Freetown",
+                                      "Africa/Gaborone",
+                                      "Africa/Harare",
+                                      "Africa/Johannesburg",
+                                      "Africa/Juba",
+                                      "Africa/Kampala",
+                                      "Africa/Khartoum",
+                                      "Africa/Kigali",
+                                      "Africa/Kinshasa",
+                                      "Africa/Lagos",
+                                      "Africa/Libreville",
+                                      "Africa/Lome",
+                                      "Africa/Luanda",
+                                      "Africa/Lubumbashi",
+                                      "Africa/Lusaka",
+                                      "Africa/Malabo",
+                                      "Africa/Maputo",
+                                      "Africa/Maseru",
+                                      "Africa/Mbabane",
+                                      "Africa/Mogadishu",
+                                      "Africa/Monrovia",
+                                      "Africa/Nairobi",
+                                      "Africa/Ndjamena",
+                                      "Africa/Niamey",
+                                      "Africa/Nouakchott",
+                                      "Africa/Ouagadougou",
+                                      "Africa/Porto-Novo",
+                                      "Africa/Sao_Tome",
+                                      "Africa/Timbuktu",
+                                      "Africa/Tripoli",
+                                      "Africa/Tunis",
+                                      "Africa/Windhoek",
+                                      "America/Adak",
+                                      "America/Anchorage",
+                                      "America/Anguilla",
+                                      "America/Antigua",
+                                      "America/Araguaina",
+                                      "America/Argentina/Buenos_Aires",
+                                      "America/Argentina/Catamarca",
+                                      "America/Argentina/ComodRivadavia",
+                                      "America/Argentina/Cordoba",
+                                      "America/Argentina/Jujuy",
+                                      "America/Argentina/La_Rioja",
+                                      "America/Argentina/Mendoza",
+                                      "America/Argentina/Rio_Gallegos",
+                                      "America/Argentina/Salta",
+                                      "America/Argentina/San_Juan",
+                                      "America/Argentina/San_Luis",
+                                      "America/Argentina/Tucuman",
+                                      "America/Argentina/Ushuaia",
+                                      "America/Aruba",
+                                      "America/Asuncion",
+                                      "America/Atikokan",
+                                      "America/Atka",
+                                      "America/Bahia",
+                                      "America/Bahia_Banderas",
+                                      "America/Barbados",
+                                      "America/Belem",
+                                      "America/Belize",
+                                      "America/Blanc-Sablon",
+                                      "America/Boa_Vista",
+                                      "America/Bogota",
+                                      "America/Boise",
+                                      "America/Buenos_Aires",
+                                      "America/Cambridge_Bay",
+                                      "America/Campo_Grande",
+                                      "America/Cancun",
+                                      "America/Caracas",
+                                      "America/Catamarca",
+                                      "America/Cayenne",
+                                      "America/Cayman",
+                                      "America/Chicago",
+                                      "America/Chihuahua",
+                                      "America/Coral_Harbour",
+                                      "America/Cordoba",
+                                      "America/Costa_Rica",
+                                      "America/Creston",
+                                      "America/Cuiaba",
+                                      "America/Curacao",
+                                      "America/Danmarkshavn",
+                                      "America/Dawson",
+                                      "America/Dawson_Creek",
+                                      "America/Denver",
+                                      "America/Detroit",
+                                      "America/Dominica",
+                                      "America/Edmonton",
+                                      "America/Eirunepe",
+                                      "America/El_Salvador",
+                                      "America/Ensenada",
+                                      "America/Fort_Nelson",
+                                      "America/Fort_Wayne",
+                                      "America/Fortaleza",
+                                      "America/Glace_Bay",
+                                      "America/Godthab",
+                                      "America/Goose_Bay",
+                                      "America/Grand_Turk",
+                                      "America/Grenada",
+                                      "America/Guadeloupe",
+                                      "America/Guatemala",
+                                      "America/Guayaquil",
+                                      "America/Guyana",
+                                      "America/Halifax",
+                                      "America/Havana",
+                                      "America/Hermosillo",
+                                      "America/Indiana/Indianapolis",
+                                      "America/Indiana/Knox",
+                                      "America/Indiana/Marengo",
+                                      "America/Indiana/Petersburg",
+                                      "America/Indiana/Tell_City",
+                                      "America/Indiana/Vevay",
+                                      "America/Indiana/Vincennes",
+                                      "America/Indiana/Winamac",
+                                      "America/Indianapolis",
+                                      "America/Inuvik",
+                                      "America/Iqaluit",
+                                      "America/Jamaica",
+                                      "America/Jujuy",
+                                      "America/Juneau",
+                                      "America/Kentucky/Louisville",
+                                      "America/Kentucky/Monticello",
+                                      "America/Knox_IN",
+                                      "America/Kralendijk",
+                                      "America/La_Paz",
+                                      "America/Lima",
+                                      "America/Los_Angeles",
+                                      "America/Louisville",
+                                      "America/Lower_Princes",
+                                      "America/Maceio",
+                                      "America/Managua",
+                                      "America/Manaus",
+                                      "America/Marigot",
+                                      "America/Martinique",
+                                      "America/Matamoros",
+                                      "America/Mazatlan",
+                                      "America/Mendoza",
+                                      "America/Menominee",
+                                      "America/Merida",
+                                      "America/Metlakatla",
+                                      "America/Mexico_City",
+                                      "America/Miquelon",
+                                      "America/Moncton",
+                                      "America/Monterrey",
+                                      "America/Montevideo",
+                                      "America/Montreal",
+                                      "America/Montserrat",
+                                      "America/Nassau",
+                                      "America/New_York",
+                                      "America/Nipigon",
+                                      "America/Nome",
+                                      "America/Noronha",
+                                      "America/North_Dakota/Beulah",
+                                      "America/North_Dakota/Center",
+                                      "America/North_Dakota/New_Salem",
+                                      "America/Ojinaga",
+                                      "America/Panama",
+                                      "America/Pangnirtung",
+                                      "America/Paramaribo",
+                                      "America/Phoenix",
+                                      "America/Port-au-Prince",
+                                      "America/Port_of_Spain",
+                                      "America/Porto_Acre",
+                                      "America/Porto_Velho",
+                                      "America/Puerto_Rico",
+                                      "America/Punta_Arenas",
+                                      "America/Rainy_River",
+                                      "America/Rankin_Inlet",
+                                      "America/Recife",
+                                      "America/Regina",
+                                      "America/Resolute",
+                                      "America/Rio_Branco",
+                                      "America/Rosario",
+                                      "America/Santa_Isabel",
+                                      "America/Santarem",
+                                      "America/Santiago",
+                                      "America/Santo_Domingo",
+                                      "America/Sao_Paulo",
+                                      "America/Scoresbysund",
+                                      "America/Shiprock",
+                                      "America/Sitka",
+                                      "America/St_Barthelemy",
+                                      "America/St_Johns",
+                                      "America/St_Kitts",
+                                      "America/St_Lucia",
+                                      "America/St_Thomas",
+                                      "America/St_Vincent",
+                                      "America/Swift_Current",
+                                      "America/Tegucigalpa",
+                                      "America/Thule",
+                                      "America/Thunder_Bay",
+                                      "America/Tijuana",
+                                      "America/Toronto",
+                                      "America/Tortola",
+                                      "America/Vancouver",
+                                      "America/Virgin",
+                                      "America/Whitehorse",
+                                      "America/Winnipeg",
+                                      "America/Yakutat",
+                                      "America/Yellowknife",
+                                      "Antarctica/Casey",
+                                      "Antarctica/Davis",
+                                      "Antarctica/DumontDUrville",
+                                      "Antarctica/Macquarie",
+                                      "Antarctica/Mawson",
+                                      "Antarctica/McMurdo",
+                                      "Antarctica/Palmer",
+                                      "Antarctica/Rothera",
+                                      "Antarctica/South_Pole",
+                                      "Antarctica/Syowa",
+                                      "Antarctica/Troll",
+                                      "Antarctica/Vostok",
+                                      "Arctic/Longyearbyen",
+                                      "Asia/Aden",
+                                      "Asia/Almaty",
+                                      "Asia/Amman",
+                                      "Asia/Anadyr",
+                                      "Asia/Aqtau",
+                                      "Asia/Aqtobe",
+                                      "Asia/Ashgabat",
+                                      "Asia/Ashkhabad",
+                                      "Asia/Atyrau",
+                                      "Asia/Baghdad",
+                                      "Asia/Bahrain",
+                                      "Asia/Baku",
+                                      "Asia/Bangkok",
+                                      "Asia/Barnaul",
+                                      "Asia/Beirut",
+                                      "Asia/Bishkek",
+                                      "Asia/Brunei",
+                                      "Asia/Calcutta",
+                                      "Asia/Chita",
+                                      "Asia/Choibalsan",
+                                      "Asia/Chongqing",
+                                      "Asia/Chungking",
+                                      "Asia/Colombo",
+                                      "Asia/Dacca",
+                                      "Asia/Damascus",
+                                      "Asia/Dhaka",
+                                      "Asia/Dili",
+                                      "Asia/Dubai",
+                                      "Asia/Dushanbe",
+                                      "Asia/Famagusta",
+                                      "Asia/Gaza",
+                                      "Asia/Harbin",
+                                      "Asia/Hebron",
+                                      "Asia/Ho_Chi_Minh",
+                                      "Asia/Hong_Kong",
+                                      "Asia/Hovd",
+                                      "Asia/Irkutsk",
+                                      "Asia/Istanbul",
+                                      "Asia/Jakarta",
+                                      "Asia/Jayapura",
+                                      "Asia/Jerusalem",
+                                      "Asia/Kabul",
+                                      "Asia/Kamchatka",
+                                      "Asia/Karachi",
+                                      "Asia/Kashgar",
+                                      "Asia/Kathmandu",
+                                      "Asia/Katmandu",
+                                      "Asia/Khandyga",
+                                      "Asia/Kolkata",
+                                      "Asia/Krasnoyarsk",
+                                      "Asia/Kuala_Lumpur",
+                                      "Asia/Kuching",
+                                      "Asia/Kuwait",
+                                      "Asia/Macao",
+                                      "Asia/Macau",
+                                      "Asia/Magadan",
+                                      "Asia/Makassar",
+                                      "Asia/Manila",
+                                      "Asia/Muscat",
+                                      "Asia/Nicosia",
+                                      "Asia/Novokuznetsk",
+                                      "Asia/Novosibirsk",
+                                      "Asia/Omsk",
+                                      "Asia/Oral",
+                                      "Asia/Phnom_Penh",
+                                      "Asia/Pontianak",
+                                      "Asia/Pyongyang",
+                                      "Asia/Qatar",
+                                      "Asia/Qostanay",
+                                      "Asia/Qyzylorda",
+                                      "Asia/Rangoon",
+                                      "Asia/Riyadh",
+                                      "Asia/Saigon",
+                                      "Asia/Sakhalin",
+                                      "Asia/Samarkand",
+                                      "Asia/Seoul",
+                                      "Asia/Shanghai",
+                                      "Asia/Singapore",
+                                      "Asia/Srednekolymsk",
+                                      "Asia/Taipei",
+                                      "Asia/Tashkent",
+                                      "Asia/Tbilisi",
+                                      "Asia/Tehran",
+                                      "Asia/Tel_Aviv",
+                                      "Asia/Thimbu",
+                                      "Asia/Thimphu",
+                                      "Asia/Tokyo",
+                                      "Asia/Tomsk",
+                                      "Asia/Ujung_Pandang",
+                                      "Asia/Ulaanbaatar",
+                                      "Asia/Ulan_Bator",
+                                      "Asia/Urumqi",
+                                      "Asia/Ust-Nera",
+                                      "Asia/Vientiane",
+                                      "Asia/Vladivostok",
+                                      "Asia/Yakutsk",
+                                      "Asia/Yangon",
+                                      "Asia/Yekaterinburg",
+                                      "Asia/Yerevan",
+                                      "Atlantic/Azores",
+                                      "Atlantic/Bermuda",
+                                      "Atlantic/Canary",
+                                      "Atlantic/Cape_Verde",
+                                      "Atlantic/Faeroe",
+                                      "Atlantic/Faroe",
+                                      "Atlantic/Jan_Mayen",
+                                      "Atlantic/Madeira",
+                                      "Atlantic/Reykjavik",
+                                      "Atlantic/South_Georgia",
+                                      "Atlantic/St_Helena",
+                                      "Atlantic/Stanley",
+                                      "Australia/ACT",
+                                      "Australia/Adelaide",
+                                      "Australia/Brisbane",
+                                      "Australia/Broken_Hill",
+                                      "Australia/Canberra",
+                                      "Australia/Currie",
+                                      "Australia/Darwin",
+                                      "Australia/Eucla",
+                                      "Australia/Hobart",
+                                      "Australia/LHI",
+                                      "Australia/Lindeman",
+                                      "Australia/Lord_Howe",
+                                      "Australia/Melbourne",
+                                      "Australia/NSW",
+                                      "Australia/North",
+                                      "Australia/Perth",
+                                      "Australia/Queensland",
+                                      "Australia/South",
+                                      "Australia/Sydney",
+                                      "Australia/Tasmania",
+                                      "Australia/Victoria",
+                                      "Australia/West",
+                                      "Australia/Yancowinna",
+                                      "Brazil/Acre",
+                                      "Brazil/DeNoronha",
+                                      "Brazil/East",
+                                      "Brazil/West",
+                                      "CET",
+                                      "CST6CDT",
+                                      "Canada/Atlantic",
+                                      "Canada/Central",
+                                      "Canada/Eastern",
+                                      "Canada/Mountain",
+                                      "Canada/Newfoundland",
+                                      "Canada/Pacific",
+                                      "Canada/Saskatchewan",
+                                      "Canada/Yukon",
+                                      "Chile/Continental",
+                                      "Chile/EasterIsland",
+                                      "Cuba",
+                                      "EET",
+                                      "EST",
+                                      "EST5EDT",
+                                      "Egypt",
+                                      "Eire",
+                                      "Etc/GMT",
+                                      "Etc/GMT+0",
+                                      "Etc/GMT+1",
+                                      "Etc/GMT+10",
+                                      "Etc/GMT+11",
+                                      "Etc/GMT+12",
+                                      "Etc/GMT+2",
+                                      "Etc/GMT+3",
+                                      "Etc/GMT+4",
+                                      "Etc/GMT+5",
+                                      "Etc/GMT+6",
+                                      "Etc/GMT+7",
+                                      "Etc/GMT+8",
+                                      "Etc/GMT+9",
+                                      "Etc/GMT-0",
+                                      "Etc/GMT-1",
+                                      "Etc/GMT-10",
+                                      "Etc/GMT-11",
+                                      "Etc/GMT-12",
+                                      "Etc/GMT-13",
+                                      "Etc/GMT-14",
+                                      "Etc/GMT-2",
+                                      "Etc/GMT-3",
+                                      "Etc/GMT-4",
+                                      "Etc/GMT-5",
+                                      "Etc/GMT-6",
+                                      "Etc/GMT-7",
+                                      "Etc/GMT-8",
+                                      "Etc/GMT-9",
+                                      "Etc/GMT0",
+                                      "Etc/Greenwich",
+                                      "Etc/UCT",
+                                      "Etc/UTC",
+                                      "Etc/Universal",
+                                      "Etc/Zulu",
+                                      "Europe/Amsterdam",
+                                      "Europe/Andorra",
+                                      "Europe/Astrakhan",
+                                      "Europe/Athens",
+                                      "Europe/Belfast",
+                                      "Europe/Belgrade",
+                                      "Europe/Berlin",
+                                      "Europe/Bratislava",
+                                      "Europe/Brussels",
+                                      "Europe/Bucharest",
+                                      "Europe/Budapest",
+                                      "Europe/Busingen",
+                                      "Europe/Chisinau",
+                                      "Europe/Copenhagen",
+                                      "Europe/Dublin",
+                                      "Europe/Gibraltar",
+                                      "Europe/Guernsey",
+                                      "Europe/Helsinki",
+                                      "Europe/Isle_of_Man",
+                                      "Europe/Istanbul",
+                                      "Europe/Jersey",
+                                      "Europe/Kaliningrad",
+                                      "Europe/Kiev",
+                                      "Europe/Kirov",
+                                      "Europe/Lisbon",
+                                      "Europe/Ljubljana",
+                                      "Europe/London",
+                                      "Europe/Luxembourg",
+                                      "Europe/Madrid",
+                                      "Europe/Malta",
+                                      "Europe/Mariehamn",
+                                      "Europe/Minsk",
+                                      "Europe/Monaco",
+                                      "Europe/Moscow",
+                                      "Europe/Nicosia",
+                                      "Europe/Oslo",
+                                      "Europe/Paris",
+                                      "Europe/Podgorica",
+                                      "Europe/Prague",
+                                      "Europe/Riga",
+                                      "Europe/Rome",
+                                      "Europe/Samara",
+                                      "Europe/San_Marino",
+                                      "Europe/Sarajevo",
+                                      "Europe/Saratov",
+                                      "Europe/Simferopol",
+                                      "Europe/Skopje",
+                                      "Europe/Sofia",
+                                      "Europe/Stockholm",
+                                      "Europe/Tallinn",
+                                      "Europe/Tirane",
+                                      "Europe/Tiraspol",
+                                      "Europe/Ulyanovsk",
+                                      "Europe/Uzhgorod",
+                                      "Europe/Vaduz",
+                                      "Europe/Vatican",
+                                      "Europe/Vienna",
+                                      "Europe/Vilnius",
+                                      "Europe/Volgograd",
+                                      "Europe/Warsaw",
+                                      "Europe/Zagreb",
+                                      "Europe/Zaporozhye",
+                                      "Europe/Zurich",
+                                      "GB",
+                                      "GB-Eire",
+                                      "GMT",
+                                      "GMT+0",
+                                      "GMT-0",
+                                      "GMT0",
+                                      "Greenwich",
+                                      "HST",
+                                      "Hongkong",
+                                      "Iceland",
+                                      "Indian/Antananarivo",
+                                      "Indian/Chagos",
+                                      "Indian/Christmas",
+                                      "Indian/Cocos",
+                                      "Indian/Comoro",
+                                      "Indian/Kerguelen",
+                                      "Indian/Mahe",
+                                      "Indian/Maldives",
+                                      "Indian/Mauritius",
+                                      "Indian/Mayotte",
+                                      "Indian/Reunion",
+                                      "Iran",
+                                      "Israel",
+                                      "Jamaica",
+                                      "Japan",
+                                      "Kwajalein",
+                                      "Libya",
+                                      "MET",
+                                      "MST",
+                                      "MST7MDT",
+                                      "Mexico/BajaNorte",
+                                      "Mexico/BajaSur",
+                                      "Mexico/General",
+                                      "NZ",
+                                      "NZ-CHAT",
+                                      "Navajo",
+                                      "PRC",
+                                      "PST8PDT",
+                                      "Pacific/Apia",
+                                      "Pacific/Auckland",
+                                      "Pacific/Bougainville",
+                                      "Pacific/Chatham",
+                                      "Pacific/Chuuk",
+                                      "Pacific/Easter",
+                                      "Pacific/Efate",
+                                      "Pacific/Enderbury",
+                                      "Pacific/Fakaofo",
+                                      "Pacific/Fiji",
+                                      "Pacific/Funafuti",
+                                      "Pacific/Galapagos",
+                                      "Pacific/Gambier",
+                                      "Pacific/Guadalcanal",
+                                      "Pacific/Guam",
+                                      "Pacific/Honolulu",
+                                      "Pacific/Johnston",
+                                      "Pacific/Kiritimati",
+                                      "Pacific/Kosrae",
+                                      "Pacific/Kwajalein",
+                                      "Pacific/Majuro",
+                                      "Pacific/Marquesas",
+                                      "Pacific/Midway",
+                                      "Pacific/Nauru",
+                                      "Pacific/Niue",
+                                      "Pacific/Norfolk",
+                                      "Pacific/Noumea",
+                                      "Pacific/Pago_Pago",
+                                      "Pacific/Palau",
+                                      "Pacific/Pitcairn",
+                                      "Pacific/Pohnpei",
+                                      "Pacific/Ponape",
+                                      "Pacific/Port_Moresby",
+                                      "Pacific/Rarotonga",
+                                      "Pacific/Saipan",
+                                      "Pacific/Samoa",
+                                      "Pacific/Tahiti",
+                                      "Pacific/Tarawa",
+                                      "Pacific/Tongatapu",
+                                      "Pacific/Truk",
+                                      "Pacific/Wake",
+                                      "Pacific/Wallis",
+                                      "Pacific/Yap",
+                                      "Poland",
+                                      "Portugal",
+                                      "ROC",
+                                      "ROK",
+                                      "Singapore",
+                                      "Turkey",
+                                      "UCT",
+                                      "US/Alaska",
+                                      "US/Aleutian",
+                                      "US/Arizona",
+                                      "US/Central",
+                                      "US/East-Indiana",
+                                      "US/Eastern",
+                                      "US/Hawaii",
+                                      "US/Indiana-Starke",
+                                      "US/Michigan",
+                                      "US/Mountain",
+                                      "US/Pacific",
+                                      "US/Samoa",
+                                      "UTC",
+                                      "Universal",
+                                      "W-SU",
+                                      "WET",
+                                      "Zulu",
+                                      nullptr};
 
 std::vector<std::string> AllTimeZoneNames() {
   std::vector<std::string> names;
diff --git a/absl/time/internal/cctz/src/civil_time_detail.cc b/absl/time/internal/cctz/src/civil_time_detail.cc
index cb40b6bc..0b07e397 100644
--- a/absl/time/internal/cctz/src/civil_time_detail.cc
+++ b/absl/time/internal/cctz/src/civil_time_detail.cc
@@ -18,7 +18,10 @@
 #include <ostream>
 #include <sstream>
 
+#include "absl/base/config.h"
+
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 namespace detail {
@@ -87,4 +90,5 @@ std::ostream& operator<<(std::ostream& os, weekday wd) {
 }  // namespace detail
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/civil_time_test.cc b/absl/time/internal/cctz/src/civil_time_test.cc
index 10a5ffe5..be894d70 100644
--- a/absl/time/internal/cctz/src/civil_time_test.cc
+++ b/absl/time/internal/cctz/src/civil_time_test.cc
@@ -21,8 +21,10 @@
 #include <type_traits>
 
 #include "gtest/gtest.h"
+#include "absl/base/config.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -1014,19 +1016,13 @@ TEST(CivilTime, LeapYears) {
       int day;
     } leap_day;  // The date of the day after Feb 28.
   } kLeapYearTable[]{
-      {1900, 365, {3, 1}},
-      {1999, 365, {3, 1}},
+      {1900, 365, {3, 1}},  {1999, 365, {3, 1}},
       {2000, 366, {2, 29}},  // leap year
-      {2001, 365, {3, 1}},
-      {2002, 365, {3, 1}},
-      {2003, 365, {3, 1}},
-      {2004, 366, {2, 29}},  // leap year
-      {2005, 365, {3, 1}},
-      {2006, 365, {3, 1}},
-      {2007, 365, {3, 1}},
-      {2008, 366, {2, 29}},  // leap year
-      {2009, 365, {3, 1}},
-      {2100, 365, {3, 1}},
+      {2001, 365, {3, 1}},  {2002, 365, {3, 1}},
+      {2003, 365, {3, 1}},  {2004, 366, {2, 29}},  // leap year
+      {2005, 365, {3, 1}},  {2006, 365, {3, 1}},
+      {2007, 365, {3, 1}},  {2008, 366, {2, 29}},  // leap year
+      {2009, 365, {3, 1}},  {2100, 365, {3, 1}},
   };
 
   for (const auto& e : kLeapYearTable) {
@@ -1056,4 +1052,5 @@ TEST(CivilTime, FirstThursdayInMonth) {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/time_zone_fixed.cc b/absl/time/internal/cctz/src/time_zone_fixed.cc
index b0d159a2..a342e37d 100644
--- a/absl/time/internal/cctz/src/time_zone_fixed.cc
+++ b/absl/time/internal/cctz/src/time_zone_fixed.cc
@@ -20,7 +20,10 @@
 #include <cstring>
 #include <string>
 
+#include "absl/base/config.h"
+
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -59,11 +62,9 @@ bool FixedOffsetFromName(const std::string& name, seconds* offset) {
   const char* const ep = kFixedZonePrefix + prefix_len;
   if (name.size() != prefix_len + 9)  // <prefix>+99:99:99
     return false;
-  if (!std::equal(kFixedZonePrefix, ep, name.begin()))
-    return false;
+  if (!std::equal(kFixedZonePrefix, ep, name.begin())) return false;
   const char* np = name.data() + prefix_len;
-  if (np[0] != '+' && np[0] != '-')
-    return false;
+  if (np[0] != '+' && np[0] != '-') return false;
   if (np[3] != ':' || np[6] != ':')  // see note below about large offsets
     return false;
 
@@ -135,4 +136,5 @@ std::string FixedOffsetToAbbr(const seconds& offset) {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/time_zone_fixed.h b/absl/time/internal/cctz/src/time_zone_fixed.h
index 9c1f5e7d..e74a0bbd 100644
--- a/absl/time/internal/cctz/src/time_zone_fixed.h
+++ b/absl/time/internal/cctz/src/time_zone_fixed.h
@@ -17,9 +17,11 @@
 
 #include <string>
 
+#include "absl/base/config.h"
 #include "absl/time/internal/cctz/include/cctz/time_zone.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -44,6 +46,7 @@ std::string FixedOffsetToAbbr(const seconds& offset);
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_FIXED_H_
diff --git a/absl/time/internal/cctz/src/time_zone_format.cc b/absl/time/internal/cctz/src/time_zone_format.cc
index 84e280b1..950b23a1 100644
--- a/absl/time/internal/cctz/src/time_zone_format.cc
+++ b/absl/time/internal/cctz/src/time_zone_format.cc
@@ -13,17 +13,18 @@
 //   limitations under the License.
 
 #if !defined(HAS_STRPTIME)
-# if !defined(_MSC_VER) && !defined(__MINGW32__)
-#  define HAS_STRPTIME 1  // assume everyone has strptime() except windows
-# endif
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
+#define HAS_STRPTIME 1  // assume everyone has strptime() except windows
+#endif
 #endif
 
 #if defined(HAS_STRPTIME) && HAS_STRPTIME
-# if !defined(_XOPEN_SOURCE)
-#  define _XOPEN_SOURCE  // Definedness suffices for strptime.
-# endif
+#if !defined(_XOPEN_SOURCE)
+#define _XOPEN_SOURCE  // Definedness suffices for strptime.
+#endif
 #endif
 
+#include "absl/base/config.h"
 #include "absl/time/internal/cctz/include/cctz/time_zone.h"
 
 // Include time.h directly since, by C++ standards, ctime doesn't have to
@@ -48,6 +49,7 @@
 #include "time_zone_if.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 namespace detail {
@@ -502,8 +504,9 @@ std::string format(const std::string& format, const time_point<seconds>& tp,
           bp = ep;
           if (n > 0) {
             if (n > kDigits10_64) n = kDigits10_64;
-            bp = Format64(bp, n, (n > 15) ? fs.count() * kExp10[n - 15]
-                                          : fs.count() / kExp10[15 - n]);
+            bp = Format64(bp, n,
+                          (n > 15) ? fs.count() * kExp10[n - 15]
+                                   : fs.count() / kExp10[15 - n]);
             if (*np == 'S') *--bp = '.';
           }
           if (*np == 'S') bp = Format02d(bp, al.cs.second());
@@ -720,10 +723,9 @@ bool parse(const std::string& format, const std::string& input,
         data = ParseZone(data, &zone);
         continue;
       case 's':
-        data = ParseInt(data, 0,
-                        std::numeric_limits<std::int_fast64_t>::min(),
-                        std::numeric_limits<std::int_fast64_t>::max(),
-                        &percent_s);
+        data =
+            ParseInt(data, 0, std::numeric_limits<std::int_fast64_t>::min(),
+                     std::numeric_limits<std::int_fast64_t>::max(), &percent_s);
         if (data != nullptr) saw_percent_s = true;
         continue;
       case ':':
@@ -916,4 +918,5 @@ bool parse(const std::string& format, const std::string& input,
 }  // namespace detail
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/time_zone_format_test.cc b/absl/time/internal/cctz/src/time_zone_format_test.cc
index 705ccdcd..de75629a 100644
--- a/absl/time/internal/cctz/src/time_zone_format_test.cc
+++ b/absl/time/internal/cctz/src/time_zone_format_test.cc
@@ -12,20 +12,21 @@
 //   See the License for the specific language governing permissions and
 //   limitations under the License.
 
-#include "absl/time/internal/cctz/include/cctz/time_zone.h"
-
 #include <chrono>
 #include <iomanip>
 #include <sstream>
 #include <string>
 
-#include "absl/time/internal/cctz/include/cctz/civil_time.h"
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
 
 namespace chrono = std::chrono;
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -48,10 +49,10 @@ namespace {
   } while (0)
 
 const char RFC3339_full[] = "%Y-%m-%dT%H:%M:%E*S%Ez";
-const char RFC3339_sec[] =  "%Y-%m-%dT%H:%M:%S%Ez";
+const char RFC3339_sec[] = "%Y-%m-%dT%H:%M:%S%Ez";
 
 const char RFC1123_full[] = "%a, %d %b %Y %H:%M:%S %z";
-const char RFC1123_no_wday[] =  "%d %b %Y %H:%M:%S %z";
+const char RFC1123_no_wday[] = "%d %b %Y %H:%M:%S %z";
 
 // A helper that tests the given format specifier by itself, and with leading
 // and trailing characters.  For example: TestFormatSpecifier(tp, "%a", "Thu").
@@ -88,8 +89,11 @@ TEST(Format, TimePointResolution) {
       format(kFmt, chrono::time_point_cast<chrono::milliseconds>(t0), utc));
   EXPECT_EQ("03:04:05",
             format(kFmt, chrono::time_point_cast<chrono::seconds>(t0), utc));
-  EXPECT_EQ("03:04:05",
-            format(kFmt, chrono::time_point_cast<absl::time_internal::cctz::seconds>(t0), utc));
+  EXPECT_EQ(
+      "03:04:05",
+      format(kFmt,
+             chrono::time_point_cast<absl::time_internal::cctz::seconds>(t0),
+             utc));
   EXPECT_EQ("03:04:00",
             format(kFmt, chrono::time_point_cast<chrono::minutes>(t0), utc));
   EXPECT_EQ("03:00:00",
@@ -110,12 +114,10 @@ TEST(Format, TimePointExtendedResolution) {
   EXPECT_EQ(
       "12:34:56.012345678901234",
       detail::format(kFmt, tp, detail::femtoseconds(12345678901234), utc));
-  EXPECT_EQ(
-      "12:34:56.001234567890123",
-      detail::format(kFmt, tp, detail::femtoseconds(1234567890123), utc));
-  EXPECT_EQ(
-      "12:34:56.000123456789012",
-      detail::format(kFmt, tp, detail::femtoseconds(123456789012), utc));
+  EXPECT_EQ("12:34:56.001234567890123",
+            detail::format(kFmt, tp, detail::femtoseconds(1234567890123), utc));
+  EXPECT_EQ("12:34:56.000123456789012",
+            detail::format(kFmt, tp, detail::femtoseconds(123456789012), utc));
 
   EXPECT_EQ("12:34:56.000000000000123",
             detail::format(kFmt, tp, detail::femtoseconds(123), utc));
@@ -1416,8 +1418,8 @@ TEST(Parse, MaxRange) {
       parse(RFC3339_sec, "-292277022657-01-27T08:29:51+01:00", utc, &tp));
 
   // tests max/min civil-second overflow
-  EXPECT_FALSE(parse(RFC3339_sec, "9223372036854775807-12-31T23:59:59-00:01",
-                     utc, &tp));
+  EXPECT_FALSE(
+      parse(RFC3339_sec, "9223372036854775807-12-31T23:59:59-00:01", utc, &tp));
   EXPECT_FALSE(parse(RFC3339_sec, "-9223372036854775808-01-01T00:00:00+00:01",
                      utc, &tp));
 
@@ -1474,7 +1476,8 @@ TEST(FormatParse, RoundTrip) {
 
 TEST(FormatParse, RoundTripDistantFuture) {
   const time_zone utc = utc_time_zone();
-  const time_point<absl::time_internal::cctz::seconds> in = time_point<absl::time_internal::cctz::seconds>::max();
+  const time_point<absl::time_internal::cctz::seconds> in =
+      time_point<absl::time_internal::cctz::seconds>::max();
   const std::string s = format(RFC3339_full, in, utc);
   time_point<absl::time_internal::cctz::seconds> out;
   EXPECT_TRUE(parse(RFC3339_full, s, utc, &out)) << s;
@@ -1483,7 +1486,8 @@ TEST(FormatParse, RoundTripDistantFuture) {
 
 TEST(FormatParse, RoundTripDistantPast) {
   const time_zone utc = utc_time_zone();
-  const time_point<absl::time_internal::cctz::seconds> in = time_point<absl::time_internal::cctz::seconds>::min();
+  const time_point<absl::time_internal::cctz::seconds> in =
+      time_point<absl::time_internal::cctz::seconds>::min();
   const std::string s = format(RFC3339_full, in, utc);
   time_point<absl::time_internal::cctz::seconds> out;
   EXPECT_TRUE(parse(RFC3339_full, s, utc, &out)) << s;
@@ -1492,4 +1496,5 @@ TEST(FormatParse, RoundTripDistantPast) {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/time_zone_if.cc b/absl/time/internal/cctz/src/time_zone_if.cc
index 09aaee5f..0319b2f9 100644
--- a/absl/time/internal/cctz/src/time_zone_if.cc
+++ b/absl/time/internal/cctz/src/time_zone_if.cc
@@ -13,10 +13,13 @@
 //   limitations under the License.
 
 #include "time_zone_if.h"
+
+#include "absl/base/config.h"
 #include "time_zone_info.h"
 #include "time_zone_libc.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -38,4 +41,5 @@ TimeZoneIf::~TimeZoneIf() {}
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/time_zone_if.h b/absl/time/internal/cctz/src/time_zone_if.h
index d000b7a5..32c0891c 100644
--- a/absl/time/internal/cctz/src/time_zone_if.h
+++ b/absl/time/internal/cctz/src/time_zone_if.h
@@ -20,10 +20,12 @@
 #include <memory>
 #include <string>
 
+#include "absl/base/config.h"
 #include "absl/time/internal/cctz/include/cctz/civil_time.h"
 #include "absl/time/internal/cctz/include/cctz/time_zone.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -38,8 +40,7 @@ class TimeZoneIf {
 
   virtual time_zone::absolute_lookup BreakTime(
       const time_point<seconds>& tp) const = 0;
-  virtual time_zone::civil_lookup MakeTime(
-      const civil_second& cs) const = 0;
+  virtual time_zone::civil_lookup MakeTime(const civil_second& cs) const = 0;
 
   virtual bool NextTransition(const time_point<seconds>& tp,
                               time_zone::civil_transition* trans) const = 0;
@@ -58,15 +59,18 @@ class TimeZoneIf {
 // Unix clock are second aligned, but not that they share an epoch.
 inline std::int_fast64_t ToUnixSeconds(const time_point<seconds>& tp) {
   return (tp - std::chrono::time_point_cast<seconds>(
-                   std::chrono::system_clock::from_time_t(0))).count();
+                   std::chrono::system_clock::from_time_t(0)))
+      .count();
 }
 inline time_point<seconds> FromUnixSeconds(std::int_fast64_t t) {
   return std::chrono::time_point_cast<seconds>(
-             std::chrono::system_clock::from_time_t(0)) + seconds(t);
+             std::chrono::system_clock::from_time_t(0)) +
+         seconds(t);
 }
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_
diff --git a/absl/time/internal/cctz/src/time_zone_impl.cc b/absl/time/internal/cctz/src/time_zone_impl.cc
index a241e951..030ae0e1 100644
--- a/absl/time/internal/cctz/src/time_zone_impl.cc
+++ b/absl/time/internal/cctz/src/time_zone_impl.cc
@@ -20,9 +20,11 @@
 #include <unordered_map>
 #include <utility>
 
+#include "absl/base/config.h"
 #include "time_zone_fixed.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -43,9 +45,7 @@ std::mutex& TimeZoneMutex() {
 
 }  // namespace
 
-time_zone time_zone::Impl::UTC() {
-  return time_zone(UTCImpl());
-}
+time_zone time_zone::Impl::UTC() { return time_zone(UTCImpl()); }
 
 bool time_zone::Impl::LoadTimeZone(const std::string& name, time_zone* tz) {
   const time_zone::Impl* const utc_impl = UTCImpl();
@@ -117,4 +117,5 @@ const time_zone::Impl* time_zone::Impl::UTCImpl() {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/time_zone_impl.h b/absl/time/internal/cctz/src/time_zone_impl.h
index b73fad9b..69806c10 100644
--- a/absl/time/internal/cctz/src/time_zone_impl.h
+++ b/absl/time/internal/cctz/src/time_zone_impl.h
@@ -18,12 +18,14 @@
 #include <memory>
 #include <string>
 
+#include "absl/base/config.h"
 #include "absl/time/internal/cctz/include/cctz/civil_time.h"
 #include "absl/time/internal/cctz/include/cctz/time_zone.h"
 #include "time_zone_if.h"
 #include "time_zone_info.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -85,6 +87,7 @@ class time_zone::Impl {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_
diff --git a/absl/time/internal/cctz/src/time_zone_info.cc b/absl/time/internal/cctz/src/time_zone_info.cc
index d3e1ae29..971542d0 100644
--- a/absl/time/internal/cctz/src/time_zone_info.cc
+++ b/absl/time/internal/cctz/src/time_zone_info.cc
@@ -45,11 +45,13 @@
 #include <sstream>
 #include <string>
 
+#include "absl/base/config.h"
 #include "absl/time/internal/cctz/include/cctz/civil_time.h"
 #include "time_zone_fixed.h"
 #include "time_zone_posix.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -65,8 +67,8 @@ const std::int_least32_t kDaysPerYear[2] = {365, 366};
 // The day offsets of the beginning of each (1-based) month in non-leap and
 // leap years respectively (e.g., 335 days before December in a leap year).
 const std::int_least16_t kMonthOffsets[2][1 + 12 + 1] = {
-  {-1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
-  {-1, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366},
+    {-1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
+    {-1, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366},
 };
 
 // We reject leap-second encoded zoneinfo and so assume 60-second minutes.
@@ -77,8 +79,8 @@ const std::int_least64_t kSecsPer400Years = 146097LL * kSecsPerDay;
 
 // Like kDaysPerYear[] but scaled up by a factor of kSecsPerDay.
 const std::int_least32_t kSecsPerYear[2] = {
-  365 * kSecsPerDay,
-  366 * kSecsPerDay,
+    365 * kSecsPerDay,
+    366 * kSecsPerDay,
 };
 
 // Single-byte, unsigned numeric values are encoded directly.
@@ -172,8 +174,8 @@ inline time_zone::civil_lookup MakeRepeated(const Transition& tr,
 }
 
 inline civil_second YearShift(const civil_second& cs, year_t shift) {
-  return civil_second(cs.year() + shift, cs.month(), cs.day(),
-                      cs.hour(), cs.minute(), cs.second());
+  return civil_second(cs.year() + shift, cs.month(), cs.day(), cs.hour(),
+                      cs.minute(), cs.second());
 }
 
 }  // namespace
@@ -216,7 +218,7 @@ bool TimeZoneInfo::ResetToBuiltinUTC(const seconds& offset) {
   default_transition_type_ = 0;
   abbreviations_ = FixedOffsetToAbbr(offset);
   abbreviations_.append(1, '\0');  // add NUL
-  future_spec_.clear();  // never needed for a fixed-offset zone
+  future_spec_.clear();            // never needed for a fixed-offset zone
   extended_ = false;
 
   tt.civil_max = LocalTime(seconds::max().count(), tt).cs;
@@ -393,31 +395,24 @@ void TimeZoneInfo::ExtendTransitions(const std::string& name,
 bool TimeZoneInfo::Load(const std::string& name, ZoneInfoSource* zip) {
   // Read and validate the header.
   tzhead tzh;
-  if (zip->Read(&tzh, sizeof(tzh)) != sizeof(tzh))
-    return false;
+  if (zip->Read(&tzh, sizeof(tzh)) != sizeof(tzh)) return false;
   if (strncmp(tzh.tzh_magic, TZ_MAGIC, sizeof(tzh.tzh_magic)) != 0)
     return false;
   Header hdr;
-  if (!hdr.Build(tzh))
-    return false;
+  if (!hdr.Build(tzh)) return false;
   std::size_t time_len = 4;
   if (tzh.tzh_version[0] != '\0') {
     // Skip the 4-byte data.
-    if (zip->Skip(hdr.DataLength(time_len)) != 0)
-      return false;
+    if (zip->Skip(hdr.DataLength(time_len)) != 0) return false;
     // Read and validate the header for the 8-byte data.
-    if (zip->Read(&tzh, sizeof(tzh)) != sizeof(tzh))
-      return false;
+    if (zip->Read(&tzh, sizeof(tzh)) != sizeof(tzh)) return false;
     if (strncmp(tzh.tzh_magic, TZ_MAGIC, sizeof(tzh.tzh_magic)) != 0)
       return false;
-    if (tzh.tzh_version[0] == '\0')
-      return false;
-    if (!hdr.Build(tzh))
-      return false;
+    if (tzh.tzh_version[0] == '\0') return false;
+    if (!hdr.Build(tzh)) return false;
     time_len = 8;
   }
-  if (hdr.typecnt == 0)
-    return false;
+  if (hdr.typecnt == 0) return false;
   if (hdr.leapcnt != 0) {
     // This code assumes 60-second minutes so we do not want
     // the leap-second encoded zoneinfo. We could reverse the
@@ -425,16 +420,13 @@ bool TimeZoneInfo::Load(const std::string& name, ZoneInfoSource* zip) {
     // so currently we simply reject such data.
     return false;
   }
-  if (hdr.ttisstdcnt != 0 && hdr.ttisstdcnt != hdr.typecnt)
-    return false;
-  if (hdr.ttisutcnt != 0 && hdr.ttisutcnt != hdr.typecnt)
-    return false;
+  if (hdr.ttisstdcnt != 0 && hdr.ttisstdcnt != hdr.typecnt) return false;
+  if (hdr.ttisutcnt != 0 && hdr.ttisutcnt != hdr.typecnt) return false;
 
   // Read the data into a local buffer.
   std::size_t len = hdr.DataLength(time_len);
   std::vector<char> tbuf(len);
-  if (zip->Read(tbuf.data(), len) != len)
-    return false;
+  if (zip->Read(tbuf.data(), len) != len) return false;
   const char* bp = tbuf.data();
 
   // Decode and validate the transitions.
@@ -452,10 +444,8 @@ bool TimeZoneInfo::Load(const std::string& name, ZoneInfoSource* zip) {
   bool seen_type_0 = false;
   for (std::size_t i = 0; i != hdr.timecnt; ++i) {
     transitions_[i].type_index = Decode8(bp++);
-    if (transitions_[i].type_index >= hdr.typecnt)
-      return false;
-    if (transitions_[i].type_index == 0)
-      seen_type_0 = true;
+    if (transitions_[i].type_index >= hdr.typecnt) return false;
+    if (transitions_[i].type_index == 0) seen_type_0 = true;
   }
 
   // Decode and validate the transition types.
@@ -469,8 +459,7 @@ bool TimeZoneInfo::Load(const std::string& name, ZoneInfoSource* zip) {
     bp += 4;
     transition_types_[i].is_dst = (Decode8(bp++) != 0);
     transition_types_[i].abbr_index = Decode8(bp++);
-    if (transition_types_[i].abbr_index >= hdr.charcnt)
-      return false;
+    if (transition_types_[i].abbr_index >= hdr.charcnt) return false;
   }
 
   // Determine the before-first-transition type.
@@ -479,13 +468,10 @@ bool TimeZoneInfo::Load(const std::string& name, ZoneInfoSource* zip) {
     std::uint_fast8_t index = 0;
     if (transition_types_[0].is_dst) {
       index = transitions_[0].type_index;
-      while (index != 0 && transition_types_[index].is_dst)
-        --index;
+      while (index != 0 && transition_types_[index].is_dst) --index;
     }
-    while (index != hdr.typecnt && transition_types_[index].is_dst)
-      ++index;
-    if (index != hdr.typecnt)
-      default_transition_type_ = index;
+    while (index != hdr.typecnt && transition_types_[index].is_dst) ++index;
+    if (index != hdr.typecnt) default_transition_type_ = index;
   }
 
   // Copy all the abbreviations.
@@ -509,11 +495,9 @@ bool TimeZoneInfo::Load(const std::string& name, ZoneInfoSource* zip) {
       unsigned char ch;  // all non-EOF results are positive
       return (azip->Read(&ch, 1) == 1) ? ch : EOF;
     };
-    if (get_char(zip) != '\n')
-      return false;
+    if (get_char(zip) != '\n') return false;
     for (int c = get_char(zip); c != '\n'; c = get_char(zip)) {
-      if (c == EOF)
-        return false;
+      if (c == EOF) return false;
       future_spec_.push_back(static_cast<char>(c));
     }
   }
@@ -624,7 +608,7 @@ class FileZoneInfoSource : public ZoneInfoSource {
       : fp_(fp, fclose), len_(len) {}
 
  private:
-  std::unique_ptr<FILE, int(*)(FILE*)> fp_;
+  std::unique_ptr<FILE, int (*)(FILE*)> fp_;
   std::size_t len_;
 };
 
@@ -748,13 +732,13 @@ time_zone::absolute_lookup TimeZoneInfo::LocalTime(
   // A civil time in "+offset" looks like (time+offset) in UTC.
   // Note: We perform two additions in the civil_second domain to
   // sidestep the chance of overflow in (unix_time + tt.utc_offset).
-  return {(civil_second() + unix_time) + tt.utc_offset,
-          tt.utc_offset, tt.is_dst, &abbreviations_[tt.abbr_index]};
+  return {(civil_second() + unix_time) + tt.utc_offset, tt.utc_offset,
+          tt.is_dst, &abbreviations_[tt.abbr_index]};
 }
 
 // BreakTime() translation for a particular transition.
-time_zone::absolute_lookup TimeZoneInfo::LocalTime(
-    std::int_fast64_t unix_time, const Transition& tr) const {
+time_zone::absolute_lookup TimeZoneInfo::LocalTime(std::int_fast64_t unix_time,
+                                                   const Transition& tr) const {
   const TransitionType& tt = transition_types_[tr.type_index];
   // Note: (unix_time - tr.unix_time) will never overflow as we
   // have ensured that there is always a "nearby" transition.
@@ -897,9 +881,7 @@ time_zone::civil_lookup TimeZoneInfo::MakeTime(const civil_second& cs) const {
   return MakeUnique(tr->unix_time + (cs - tr->civil_sec));
 }
 
-std::string TimeZoneInfo::Version() const {
-  return version_;
-}
+std::string TimeZoneInfo::Version() const { return version_; }
 
 std::string TimeZoneInfo::Description() const {
   std::ostringstream oss;
@@ -921,8 +903,8 @@ bool TimeZoneInfo::NextTransition(const time_point<seconds>& tp,
   }
   std::int_fast64_t unix_time = ToUnixSeconds(tp);
   const Transition target = {unix_time, 0, civil_second(), civil_second()};
-  const Transition* tr = std::upper_bound(begin, end, target,
-                                          Transition::ByUnixTime());
+  const Transition* tr =
+      std::upper_bound(begin, end, target, Transition::ByUnixTime());
   for (; tr != end; ++tr) {  // skip no-op transitions
     std::uint_fast8_t prev_type_index =
         (tr == begin) ? default_transition_type_ : tr[-1].type_index;
@@ -956,8 +938,8 @@ bool TimeZoneInfo::PrevTransition(const time_point<seconds>& tp,
     unix_time += 1;  // ceils
   }
   const Transition target = {unix_time, 0, civil_second(), civil_second()};
-  const Transition* tr = std::lower_bound(begin, end, target,
-                                          Transition::ByUnixTime());
+  const Transition* tr =
+      std::lower_bound(begin, end, target, Transition::ByUnixTime());
   for (; tr != begin; --tr) {  // skip no-op transitions
     std::uint_fast8_t prev_type_index =
         (tr - 1 == begin) ? default_transition_type_ : tr[-2].type_index;
@@ -972,4 +954,5 @@ bool TimeZoneInfo::PrevTransition(const time_point<seconds>& tp,
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/time_zone_info.h b/absl/time/internal/cctz/src/time_zone_info.h
index 81cd402f..2a10c06c 100644
--- a/absl/time/internal/cctz/src/time_zone_info.h
+++ b/absl/time/internal/cctz/src/time_zone_info.h
@@ -21,6 +21,7 @@
 #include <string>
 #include <vector>
 
+#include "absl/base/config.h"
 #include "absl/time/internal/cctz/include/cctz/civil_time.h"
 #include "absl/time/internal/cctz/include/cctz/time_zone.h"
 #include "absl/time/internal/cctz/include/cctz/zone_info_source.h"
@@ -28,6 +29,7 @@
 #include "tzfile.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -72,8 +74,7 @@ class TimeZoneInfo : public TimeZoneIf {
   // TimeZoneIf implementations.
   time_zone::absolute_lookup BreakTime(
       const time_point<seconds>& tp) const override;
-  time_zone::civil_lookup MakeTime(
-      const civil_second& cs) const override;
+  time_zone::civil_lookup MakeTime(const civil_second& cs) const override;
   bool NextTransition(const time_point<seconds>& tp,
                       time_zone::civil_transition* trans) const override;
   bool PrevTransition(const time_point<seconds>& tp,
@@ -82,7 +83,7 @@ class TimeZoneInfo : public TimeZoneIf {
   std::string Description() const override;
 
  private:
-  struct Header {  // counts of:
+  struct Header {            // counts of:
     std::size_t timecnt;     // transition times
     std::size_t typecnt;     // transition types
     std::size_t charcnt;     // zone abbreviation characters
@@ -114,7 +115,7 @@ class TimeZoneInfo : public TimeZoneIf {
 
   std::vector<Transition> transitions_;  // ordered by unix_time and civil_sec
   std::vector<TransitionType> transition_types_;  // distinct transition types
-  std::uint_fast8_t default_transition_type_;  // for before first transition
+  std::uint_fast8_t default_transition_type_;     // for before first transition
   std::string abbreviations_;  // all the NUL-terminated abbreviations
 
   std::string version_;      // the tzdata version if available
@@ -131,6 +132,7 @@ class TimeZoneInfo : public TimeZoneIf {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_INFO_H_
diff --git a/absl/time/internal/cctz/src/time_zone_libc.cc b/absl/time/internal/cctz/src/time_zone_libc.cc
index 6095e764..47cf84c6 100644
--- a/absl/time/internal/cctz/src/time_zone_libc.cc
+++ b/absl/time/internal/cctz/src/time_zone_libc.cc
@@ -23,10 +23,12 @@
 #include <limits>
 #include <utility>
 
+#include "absl/base/config.h"
 #include "absl/time/internal/cctz/include/cctz/civil_time.h"
 #include "absl/time/internal/cctz/include/cctz/time_zone.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -84,9 +86,7 @@ auto tm_gmtoff(const T& tm) -> decltype(tm.__tm_gmtoff) {
 }
 #endif  // tm_gmtoff
 #if defined(tm_zone)
-auto tm_zone(const std::tm& tm) -> decltype(tm.tm_zone) {
-  return tm.tm_zone;
-}
+auto tm_zone(const std::tm& tm) -> decltype(tm.tm_zone) { return tm.tm_zone; }
 #elif defined(__tm_zone)
 auto tm_zone(const std::tm& tm) -> decltype(tm.__tm_zone) {
   return tm.__tm_zone;
@@ -103,19 +103,19 @@ auto tm_zone(const T& tm) -> decltype(tm.__tm_zone) {
 #endif  // tm_zone
 #endif
 
-inline std::tm* gm_time(const std::time_t *timep, std::tm *result) {
+inline std::tm* gm_time(const std::time_t* timep, std::tm* result) {
 #if defined(_WIN32) || defined(_WIN64)
-    return gmtime_s(result, timep) ? nullptr : result;
+  return gmtime_s(result, timep) ? nullptr : result;
 #else
-    return gmtime_r(timep, result);
+  return gmtime_r(timep, result);
 #endif
 }
 
-inline std::tm* local_time(const std::time_t *timep, std::tm *result) {
+inline std::tm* local_time(const std::time_t* timep, std::tm* result) {
 #if defined(_WIN32) || defined(_WIN64)
-    return localtime_s(result, timep) ? nullptr : result;
+  return localtime_s(result, timep) ? nullptr : result;
 #else
-    return localtime_r(timep, result);
+  return localtime_r(timep, result);
 #endif
 }
 
@@ -208,8 +208,8 @@ time_zone::absolute_lookup TimeZoneLibC::BreakTime(
   }
 
   const year_t year = tmp->tm_year + year_t{1900};
-  al.cs = civil_second(year, tmp->tm_mon + 1, tmp->tm_mday,
-                       tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+  al.cs = civil_second(year, tmp->tm_mon + 1, tmp->tm_mday, tmp->tm_hour,
+                       tmp->tm_min, tmp->tm_sec);
   al.offset = static_cast<int>(tm_gmtoff(*tmp));
   al.abbr = local_ ? tm_zone(*tmp) : "UTC";  // as expected by cctz
   al.is_dst = tmp->tm_isdst > 0;
@@ -304,4 +304,5 @@ std::string TimeZoneLibC::Description() const {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/time_zone_libc.h b/absl/time/internal/cctz/src/time_zone_libc.h
index 0d18e9a7..1da9039a 100644
--- a/absl/time/internal/cctz/src/time_zone_libc.h
+++ b/absl/time/internal/cctz/src/time_zone_libc.h
@@ -17,9 +17,11 @@
 
 #include <string>
 
+#include "absl/base/config.h"
 #include "time_zone_if.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -33,8 +35,7 @@ class TimeZoneLibC : public TimeZoneIf {
   // TimeZoneIf implementations.
   time_zone::absolute_lookup BreakTime(
       const time_point<seconds>& tp) const override;
-  time_zone::civil_lookup MakeTime(
-      const civil_second& cs) const override;
+  time_zone::civil_lookup MakeTime(const civil_second& cs) const override;
   bool NextTransition(const time_point<seconds>& tp,
                       time_zone::civil_transition* trans) const override;
   bool PrevTransition(const time_point<seconds>& tp,
@@ -48,6 +49,7 @@ class TimeZoneLibC : public TimeZoneIf {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_LIBC_H_
diff --git a/absl/time/internal/cctz/src/time_zone_lookup.cc b/absl/time/internal/cctz/src/time_zone_lookup.cc
index 3c53dd1a..efdea64b 100644
--- a/absl/time/internal/cctz/src/time_zone_lookup.cc
+++ b/absl/time/internal/cctz/src/time_zone_lookup.cc
@@ -12,6 +12,7 @@
 //   See the License for the specific language governing permissions and
 //   limitations under the License.
 
+#include "absl/base/config.h"
 #include "absl/time/internal/cctz/include/cctz/time_zone.h"
 
 #if defined(__ANDROID__)
@@ -23,6 +24,7 @@
 
 #if defined(__APPLE__)
 #include <CoreFoundation/CFTimeZone.h>
+
 #include <vector>
 #endif
 
@@ -34,6 +36,7 @@
 #include "time_zone_impl.h"
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -66,9 +69,7 @@ int __system_property_get(const char* name, char* value) {
 }  // namespace
 #endif
 
-std::string time_zone::name() const {
-  return effective_impl().Name();
-}
+std::string time_zone::name() const { return effective_impl().Name(); }
 
 time_zone::absolute_lookup time_zone::lookup(
     const time_point<seconds>& tp) const {
@@ -89,9 +90,7 @@ bool time_zone::prev_transition(const time_point<seconds>& tp,
   return effective_impl().PrevTransition(tp, trans);
 }
 
-std::string time_zone::version() const {
-  return effective_impl().Version();
-}
+std::string time_zone::version() const { return effective_impl().Version(); }
 
 std::string time_zone::description() const {
   return effective_impl().Description();
@@ -184,4 +183,5 @@ time_zone local_time_zone() {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/time_zone_lookup_test.cc b/absl/time/internal/cctz/src/time_zone_lookup_test.cc
index 42dd6d55..227b1278 100644
--- a/absl/time/internal/cctz/src/time_zone_lookup_test.cc
+++ b/absl/time/internal/cctz/src/time_zone_lookup_test.cc
@@ -12,8 +12,6 @@
 //   See the License for the specific language governing permissions and
 //   limitations under the License.
 
-#include "absl/time/internal/cctz/include/cctz/time_zone.h"
-
 #include <chrono>
 #include <cstddef>
 #include <cstdlib>
@@ -23,613 +21,614 @@
 #include <thread>
 #include <vector>
 
-#include "absl/time/internal/cctz/include/cctz/civil_time.h"
 #include "gtest/gtest.h"
+#include "absl/base/config.h"
+#include "absl/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
 
 namespace chrono = std::chrono;
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
 namespace {
 
 // A list of known time-zone names.
-const char* const kTimeZoneNames[] = {
-  "Africa/Abidjan",
-  "Africa/Accra",
-  "Africa/Addis_Ababa",
-  "Africa/Algiers",
-  "Africa/Asmara",
-  "Africa/Asmera",
-  "Africa/Bamako",
-  "Africa/Bangui",
-  "Africa/Banjul",
-  "Africa/Bissau",
-  "Africa/Blantyre",
-  "Africa/Brazzaville",
-  "Africa/Bujumbura",
-  "Africa/Cairo",
-  "Africa/Casablanca",
-  "Africa/Ceuta",
-  "Africa/Conakry",
-  "Africa/Dakar",
-  "Africa/Dar_es_Salaam",
-  "Africa/Djibouti",
-  "Africa/Douala",
-  "Africa/El_Aaiun",
-  "Africa/Freetown",
-  "Africa/Gaborone",
-  "Africa/Harare",
-  "Africa/Johannesburg",
-  "Africa/Juba",
-  "Africa/Kampala",
-  "Africa/Khartoum",
-  "Africa/Kigali",
-  "Africa/Kinshasa",
-  "Africa/Lagos",
-  "Africa/Libreville",
-  "Africa/Lome",
-  "Africa/Luanda",
-  "Africa/Lubumbashi",
-  "Africa/Lusaka",
-  "Africa/Malabo",
-  "Africa/Maputo",
-  "Africa/Maseru",
-  "Africa/Mbabane",
-  "Africa/Mogadishu",
-  "Africa/Monrovia",
-  "Africa/Nairobi",
-  "Africa/Ndjamena",
-  "Africa/Niamey",
-  "Africa/Nouakchott",
-  "Africa/Ouagadougou",
-  "Africa/Porto-Novo",
-  "Africa/Sao_Tome",
-  "Africa/Timbuktu",
-  "Africa/Tripoli",
-  "Africa/Tunis",
-  "Africa/Windhoek",
-  "America/Adak",
-  "America/Anchorage",
-  "America/Anguilla",
-  "America/Antigua",
-  "America/Araguaina",
-  "America/Argentina/Buenos_Aires",
-  "America/Argentina/Catamarca",
-  "America/Argentina/ComodRivadavia",
-  "America/Argentina/Cordoba",
-  "America/Argentina/Jujuy",
-  "America/Argentina/La_Rioja",
-  "America/Argentina/Mendoza",
-  "America/Argentina/Rio_Gallegos",
-  "America/Argentina/Salta",
-  "America/Argentina/San_Juan",
-  "America/Argentina/San_Luis",
-  "America/Argentina/Tucuman",
-  "America/Argentina/Ushuaia",
-  "America/Aruba",
-  "America/Asuncion",
-  "America/Atikokan",
-  "America/Atka",
-  "America/Bahia",
-  "America/Bahia_Banderas",
-  "America/Barbados",
-  "America/Belem",
-  "America/Belize",
-  "America/Blanc-Sablon",
-  "America/Boa_Vista",
-  "America/Bogota",
-  "America/Boise",
-  "America/Buenos_Aires",
-  "America/Cambridge_Bay",
-  "America/Campo_Grande",
-  "America/Cancun",
-  "America/Caracas",
-  "America/Catamarca",
-  "America/Cayenne",
-  "America/Cayman",
-  "America/Chicago",
-  "America/Chihuahua",
-  "America/Coral_Harbour",
-  "America/Cordoba",
-  "America/Costa_Rica",
-  "America/Creston",
-  "America/Cuiaba",
-  "America/Curacao",
-  "America/Danmarkshavn",
-  "America/Dawson",
-  "America/Dawson_Creek",
-  "America/Denver",
-  "America/Detroit",
-  "America/Dominica",
-  "America/Edmonton",
-  "America/Eirunepe",
-  "America/El_Salvador",
-  "America/Ensenada",
-  "America/Fort_Nelson",
-  "America/Fort_Wayne",
-  "America/Fortaleza",
-  "America/Glace_Bay",
-  "America/Godthab",
-  "America/Goose_Bay",
-  "America/Grand_Turk",
-  "America/Grenada",
-  "America/Guadeloupe",
-  "America/Guatemala",
-  "America/Guayaquil",
-  "America/Guyana",
-  "America/Halifax",
-  "America/Havana",
-  "America/Hermosillo",
-  "America/Indiana/Indianapolis",
-  "America/Indiana/Knox",
-  "America/Indiana/Marengo",
-  "America/Indiana/Petersburg",
-  "America/Indiana/Tell_City",
-  "America/Indiana/Vevay",
-  "America/Indiana/Vincennes",
-  "America/Indiana/Winamac",
-  "America/Indianapolis",
-  "America/Inuvik",
-  "America/Iqaluit",
-  "America/Jamaica",
-  "America/Jujuy",
-  "America/Juneau",
-  "America/Kentucky/Louisville",
-  "America/Kentucky/Monticello",
-  "America/Knox_IN",
-  "America/Kralendijk",
-  "America/La_Paz",
-  "America/Lima",
-  "America/Los_Angeles",
-  "America/Louisville",
-  "America/Lower_Princes",
-  "America/Maceio",
-  "America/Managua",
-  "America/Manaus",
-  "America/Marigot",
-  "America/Martinique",
-  "America/Matamoros",
-  "America/Mazatlan",
-  "America/Mendoza",
-  "America/Menominee",
-  "America/Merida",
-  "America/Metlakatla",
-  "America/Mexico_City",
-  "America/Miquelon",
-  "America/Moncton",
-  "America/Monterrey",
-  "America/Montevideo",
-  "America/Montreal",
-  "America/Montserrat",
-  "America/Nassau",
-  "America/New_York",
-  "America/Nipigon",
-  "America/Nome",
-  "America/Noronha",
-  "America/North_Dakota/Beulah",
-  "America/North_Dakota/Center",
-  "America/North_Dakota/New_Salem",
-  "America/Ojinaga",
-  "America/Panama",
-  "America/Pangnirtung",
-  "America/Paramaribo",
-  "America/Phoenix",
-  "America/Port-au-Prince",
-  "America/Port_of_Spain",
-  "America/Porto_Acre",
-  "America/Porto_Velho",
-  "America/Puerto_Rico",
-  "America/Punta_Arenas",
-  "America/Rainy_River",
-  "America/Rankin_Inlet",
-  "America/Recife",
-  "America/Regina",
-  "America/Resolute",
-  "America/Rio_Branco",
-  "America/Rosario",
-  "America/Santa_Isabel",
-  "America/Santarem",
-  "America/Santiago",
-  "America/Santo_Domingo",
-  "America/Sao_Paulo",
-  "America/Scoresbysund",
-  "America/Shiprock",
-  "America/Sitka",
-  "America/St_Barthelemy",
-  "America/St_Johns",
-  "America/St_Kitts",
-  "America/St_Lucia",
-  "America/St_Thomas",
-  "America/St_Vincent",
-  "America/Swift_Current",
-  "America/Tegucigalpa",
-  "America/Thule",
-  "America/Thunder_Bay",
-  "America/Tijuana",
-  "America/Toronto",
-  "America/Tortola",
-  "America/Vancouver",
-  "America/Virgin",
-  "America/Whitehorse",
-  "America/Winnipeg",
-  "America/Yakutat",
-  "America/Yellowknife",
-  "Antarctica/Casey",
-  "Antarctica/Davis",
-  "Antarctica/DumontDUrville",
-  "Antarctica/Macquarie",
-  "Antarctica/Mawson",
-  "Antarctica/McMurdo",
-  "Antarctica/Palmer",
-  "Antarctica/Rothera",
-  "Antarctica/South_Pole",
-  "Antarctica/Syowa",
-  "Antarctica/Troll",
-  "Antarctica/Vostok",
-  "Arctic/Longyearbyen",
-  "Asia/Aden",
-  "Asia/Almaty",
-  "Asia/Amman",
-  "Asia/Anadyr",
-  "Asia/Aqtau",
-  "Asia/Aqtobe",
-  "Asia/Ashgabat",
-  "Asia/Ashkhabad",
-  "Asia/Atyrau",
-  "Asia/Baghdad",
-  "Asia/Bahrain",
-  "Asia/Baku",
-  "Asia/Bangkok",
-  "Asia/Barnaul",
-  "Asia/Beirut",
-  "Asia/Bishkek",
-  "Asia/Brunei",
-  "Asia/Calcutta",
-  "Asia/Chita",
-  "Asia/Choibalsan",
-  "Asia/Chongqing",
-  "Asia/Chungking",
-  "Asia/Colombo",
-  "Asia/Dacca",
-  "Asia/Damascus",
-  "Asia/Dhaka",
-  "Asia/Dili",
-  "Asia/Dubai",
-  "Asia/Dushanbe",
-  "Asia/Famagusta",
-  "Asia/Gaza",
-  "Asia/Harbin",
-  "Asia/Hebron",
-  "Asia/Ho_Chi_Minh",
-  "Asia/Hong_Kong",
-  "Asia/Hovd",
-  "Asia/Irkutsk",
-  "Asia/Istanbul",
-  "Asia/Jakarta",
-  "Asia/Jayapura",
-  "Asia/Jerusalem",
-  "Asia/Kabul",
-  "Asia/Kamchatka",
-  "Asia/Karachi",
-  "Asia/Kashgar",
-  "Asia/Kathmandu",
-  "Asia/Katmandu",
-  "Asia/Khandyga",
-  "Asia/Kolkata",
-  "Asia/Krasnoyarsk",
-  "Asia/Kuala_Lumpur",
-  "Asia/Kuching",
-  "Asia/Kuwait",
-  "Asia/Macao",
-  "Asia/Macau",
-  "Asia/Magadan",
-  "Asia/Makassar",
-  "Asia/Manila",
-  "Asia/Muscat",
-  "Asia/Nicosia",
-  "Asia/Novokuznetsk",
-  "Asia/Novosibirsk",
-  "Asia/Omsk",
-  "Asia/Oral",
-  "Asia/Phnom_Penh",
-  "Asia/Pontianak",
-  "Asia/Pyongyang",
-  "Asia/Qatar",
-  "Asia/Qostanay",
-  "Asia/Qyzylorda",
-  "Asia/Rangoon",
-  "Asia/Riyadh",
-  "Asia/Saigon",
-  "Asia/Sakhalin",
-  "Asia/Samarkand",
-  "Asia/Seoul",
-  "Asia/Shanghai",
-  "Asia/Singapore",
-  "Asia/Srednekolymsk",
-  "Asia/Taipei",
-  "Asia/Tashkent",
-  "Asia/Tbilisi",
-  "Asia/Tehran",
-  "Asia/Tel_Aviv",
-  "Asia/Thimbu",
-  "Asia/Thimphu",
-  "Asia/Tokyo",
-  "Asia/Tomsk",
-  "Asia/Ujung_Pandang",
-  "Asia/Ulaanbaatar",
-  "Asia/Ulan_Bator",
-  "Asia/Urumqi",
-  "Asia/Ust-Nera",
-  "Asia/Vientiane",
-  "Asia/Vladivostok",
-  "Asia/Yakutsk",
-  "Asia/Yangon",
-  "Asia/Yekaterinburg",
-  "Asia/Yerevan",
-  "Atlantic/Azores",
-  "Atlantic/Bermuda",
-  "Atlantic/Canary",
-  "Atlantic/Cape_Verde",
-  "Atlantic/Faeroe",
-  "Atlantic/Faroe",
-  "Atlantic/Jan_Mayen",
-  "Atlantic/Madeira",
-  "Atlantic/Reykjavik",
-  "Atlantic/South_Georgia",
-  "Atlantic/St_Helena",
-  "Atlantic/Stanley",
-  "Australia/ACT",
-  "Australia/Adelaide",
-  "Australia/Brisbane",
-  "Australia/Broken_Hill",
-  "Australia/Canberra",
-  "Australia/Currie",
-  "Australia/Darwin",
-  "Australia/Eucla",
-  "Australia/Hobart",
-  "Australia/LHI",
-  "Australia/Lindeman",
-  "Australia/Lord_Howe",
-  "Australia/Melbourne",
-  "Australia/NSW",
-  "Australia/North",
-  "Australia/Perth",
-  "Australia/Queensland",
-  "Australia/South",
-  "Australia/Sydney",
-  "Australia/Tasmania",
-  "Australia/Victoria",
-  "Australia/West",
-  "Australia/Yancowinna",
-  "Brazil/Acre",
-  "Brazil/DeNoronha",
-  "Brazil/East",
-  "Brazil/West",
-  "CET",
-  "CST6CDT",
-  "Canada/Atlantic",
-  "Canada/Central",
-  "Canada/Eastern",
-  "Canada/Mountain",
-  "Canada/Newfoundland",
-  "Canada/Pacific",
-  "Canada/Saskatchewan",
-  "Canada/Yukon",
-  "Chile/Continental",
-  "Chile/EasterIsland",
-  "Cuba",
-  "EET",
-  "EST",
-  "EST5EDT",
-  "Egypt",
-  "Eire",
-  "Etc/GMT",
-  "Etc/GMT+0",
-  "Etc/GMT+1",
-  "Etc/GMT+10",
-  "Etc/GMT+11",
-  "Etc/GMT+12",
-  "Etc/GMT+2",
-  "Etc/GMT+3",
-  "Etc/GMT+4",
-  "Etc/GMT+5",
-  "Etc/GMT+6",
-  "Etc/GMT+7",
-  "Etc/GMT+8",
-  "Etc/GMT+9",
-  "Etc/GMT-0",
-  "Etc/GMT-1",
-  "Etc/GMT-10",
-  "Etc/GMT-11",
-  "Etc/GMT-12",
-  "Etc/GMT-13",
-  "Etc/GMT-14",
-  "Etc/GMT-2",
-  "Etc/GMT-3",
-  "Etc/GMT-4",
-  "Etc/GMT-5",
-  "Etc/GMT-6",
-  "Etc/GMT-7",
-  "Etc/GMT-8",
-  "Etc/GMT-9",
-  "Etc/GMT0",
-  "Etc/Greenwich",
-  "Etc/UCT",
-  "Etc/UTC",
-  "Etc/Universal",
-  "Etc/Zulu",
-  "Europe/Amsterdam",
-  "Europe/Andorra",
-  "Europe/Astrakhan",
-  "Europe/Athens",
-  "Europe/Belfast",
-  "Europe/Belgrade",
-  "Europe/Berlin",
-  "Europe/Bratislava",
-  "Europe/Brussels",
-  "Europe/Bucharest",
-  "Europe/Budapest",
-  "Europe/Busingen",
-  "Europe/Chisinau",
-  "Europe/Copenhagen",
-  "Europe/Dublin",
-  "Europe/Gibraltar",
-  "Europe/Guernsey",
-  "Europe/Helsinki",
-  "Europe/Isle_of_Man",
-  "Europe/Istanbul",
-  "Europe/Jersey",
-  "Europe/Kaliningrad",
-  "Europe/Kiev",
-  "Europe/Kirov",
-  "Europe/Lisbon",
-  "Europe/Ljubljana",
-  "Europe/London",
-  "Europe/Luxembourg",
-  "Europe/Madrid",
-  "Europe/Malta",
-  "Europe/Mariehamn",
-  "Europe/Minsk",
-  "Europe/Monaco",
-  "Europe/Moscow",
-  "Europe/Nicosia",
-  "Europe/Oslo",
-  "Europe/Paris",
-  "Europe/Podgorica",
-  "Europe/Prague",
-  "Europe/Riga",
-  "Europe/Rome",
-  "Europe/Samara",
-  "Europe/San_Marino",
-  "Europe/Sarajevo",
-  "Europe/Saratov",
-  "Europe/Simferopol",
-  "Europe/Skopje",
-  "Europe/Sofia",
-  "Europe/Stockholm",
-  "Europe/Tallinn",
-  "Europe/Tirane",
-  "Europe/Tiraspol",
-  "Europe/Ulyanovsk",
-  "Europe/Uzhgorod",
-  "Europe/Vaduz",
-  "Europe/Vatican",
-  "Europe/Vienna",
-  "Europe/Vilnius",
-  "Europe/Volgograd",
-  "Europe/Warsaw",
-  "Europe/Zagreb",
-  "Europe/Zaporozhye",
-  "Europe/Zurich",
-  "GB",
-  "GB-Eire",
-  "GMT",
-  "GMT+0",
-  "GMT-0",
-  "GMT0",
-  "Greenwich",
-  "HST",
-  "Hongkong",
-  "Iceland",
-  "Indian/Antananarivo",
-  "Indian/Chagos",
-  "Indian/Christmas",
-  "Indian/Cocos",
-  "Indian/Comoro",
-  "Indian/Kerguelen",
-  "Indian/Mahe",
-  "Indian/Maldives",
-  "Indian/Mauritius",
-  "Indian/Mayotte",
-  "Indian/Reunion",
-  "Iran",
-  "Israel",
-  "Jamaica",
-  "Japan",
-  "Kwajalein",
-  "Libya",
-  "MET",
-  "MST",
-  "MST7MDT",
-  "Mexico/BajaNorte",
-  "Mexico/BajaSur",
-  "Mexico/General",
-  "NZ",
-  "NZ-CHAT",
-  "Navajo",
-  "PRC",
-  "PST8PDT",
-  "Pacific/Apia",
-  "Pacific/Auckland",
-  "Pacific/Bougainville",
-  "Pacific/Chatham",
-  "Pacific/Chuuk",
-  "Pacific/Easter",
-  "Pacific/Efate",
-  "Pacific/Enderbury",
-  "Pacific/Fakaofo",
-  "Pacific/Fiji",
-  "Pacific/Funafuti",
-  "Pacific/Galapagos",
-  "Pacific/Gambier",
-  "Pacific/Guadalcanal",
-  "Pacific/Guam",
-  "Pacific/Honolulu",
-  "Pacific/Johnston",
-  "Pacific/Kiritimati",
-  "Pacific/Kosrae",
-  "Pacific/Kwajalein",
-  "Pacific/Majuro",
-  "Pacific/Marquesas",
-  "Pacific/Midway",
-  "Pacific/Nauru",
-  "Pacific/Niue",
-  "Pacific/Norfolk",
-  "Pacific/Noumea",
-  "Pacific/Pago_Pago",
-  "Pacific/Palau",
-  "Pacific/Pitcairn",
-  "Pacific/Pohnpei",
-  "Pacific/Ponape",
-  "Pacific/Port_Moresby",
-  "Pacific/Rarotonga",
-  "Pacific/Saipan",
-  "Pacific/Samoa",
-  "Pacific/Tahiti",
-  "Pacific/Tarawa",
-  "Pacific/Tongatapu",
-  "Pacific/Truk",
-  "Pacific/Wake",
-  "Pacific/Wallis",
-  "Pacific/Yap",
-  "Poland",
-  "Portugal",
-  "ROC",
-  "ROK",
-  "Singapore",
-  "Turkey",
-  "UCT",
-  "US/Alaska",
-  "US/Aleutian",
-  "US/Arizona",
-  "US/Central",
-  "US/East-Indiana",
-  "US/Eastern",
-  "US/Hawaii",
-  "US/Indiana-Starke",
-  "US/Michigan",
-  "US/Mountain",
-  "US/Pacific",
-  "US/Samoa",
-  "UTC",
-  "Universal",
-  "W-SU",
-  "WET",
-  "Zulu",
-  nullptr
-};
+const char* const kTimeZoneNames[] = {"Africa/Abidjan",
+                                      "Africa/Accra",
+                                      "Africa/Addis_Ababa",
+                                      "Africa/Algiers",
+                                      "Africa/Asmara",
+                                      "Africa/Asmera",
+                                      "Africa/Bamako",
+                                      "Africa/Bangui",
+                                      "Africa/Banjul",
+                                      "Africa/Bissau",
+                                      "Africa/Blantyre",
+                                      "Africa/Brazzaville",
+                                      "Africa/Bujumbura",
+                                      "Africa/Cairo",
+                                      "Africa/Casablanca",
+                                      "Africa/Ceuta",
+                                      "Africa/Conakry",
+                                      "Africa/Dakar",
+                                      "Africa/Dar_es_Salaam",
+                                      "Africa/Djibouti",
+                                      "Africa/Douala",
+                                      "Africa/El_Aaiun",
+                                      "Africa/Freetown",
+                                      "Africa/Gaborone",
+                                      "Africa/Harare",
+                                      "Africa/Johannesburg",
+                                      "Africa/Juba",
+                                      "Africa/Kampala",
+                                      "Africa/Khartoum",
+                                      "Africa/Kigali",
+                                      "Africa/Kinshasa",
+                                      "Africa/Lagos",
+                                      "Africa/Libreville",
+                                      "Africa/Lome",
+                                      "Africa/Luanda",
+                                      "Africa/Lubumbashi",
+                                      "Africa/Lusaka",
+                                      "Africa/Malabo",
+                                      "Africa/Maputo",
+                                      "Africa/Maseru",
+                                      "Africa/Mbabane",
+                                      "Africa/Mogadishu",
+                                      "Africa/Monrovia",
+                                      "Africa/Nairobi",
+                                      "Africa/Ndjamena",
+                                      "Africa/Niamey",
+                                      "Africa/Nouakchott",
+                                      "Africa/Ouagadougou",
+                                      "Africa/Porto-Novo",
+                                      "Africa/Sao_Tome",
+                                      "Africa/Timbuktu",
+                                      "Africa/Tripoli",
+                                      "Africa/Tunis",
+                                      "Africa/Windhoek",
+                                      "America/Adak",
+                                      "America/Anchorage",
+                                      "America/Anguilla",
+                                      "America/Antigua",
+                                      "America/Araguaina",
+                                      "America/Argentina/Buenos_Aires",
+                                      "America/Argentina/Catamarca",
+                                      "America/Argentina/ComodRivadavia",
+                                      "America/Argentina/Cordoba",
+                                      "America/Argentina/Jujuy",
+                                      "America/Argentina/La_Rioja",
+                                      "America/Argentina/Mendoza",
+                                      "America/Argentina/Rio_Gallegos",
+                                      "America/Argentina/Salta",
+                                      "America/Argentina/San_Juan",
+                                      "America/Argentina/San_Luis",
+                                      "America/Argentina/Tucuman",
+                                      "America/Argentina/Ushuaia",
+                                      "America/Aruba",
+                                      "America/Asuncion",
+                                      "America/Atikokan",
+                                      "America/Atka",
+                                      "America/Bahia",
+                                      "America/Bahia_Banderas",
+                                      "America/Barbados",
+                                      "America/Belem",
+                                      "America/Belize",
+                                      "America/Blanc-Sablon",
+                                      "America/Boa_Vista",
+                                      "America/Bogota",
+                                      "America/Boise",
+                                      "America/Buenos_Aires",
+                                      "America/Cambridge_Bay",
+                                      "America/Campo_Grande",
+                                      "America/Cancun",
+                                      "America/Caracas",
+                                      "America/Catamarca",
+                                      "America/Cayenne",
+                                      "America/Cayman",
+                                      "America/Chicago",
+                                      "America/Chihuahua",
+                                      "America/Coral_Harbour",
+                                      "America/Cordoba",
+                                      "America/Costa_Rica",
+                                      "America/Creston",
+                                      "America/Cuiaba",
+                                      "America/Curacao",
+                                      "America/Danmarkshavn",
+                                      "America/Dawson",
+                                      "America/Dawson_Creek",
+                                      "America/Denver",
+                                      "America/Detroit",
+                                      "America/Dominica",
+                                      "America/Edmonton",
+                                      "America/Eirunepe",
+                                      "America/El_Salvador",
+                                      "America/Ensenada",
+                                      "America/Fort_Nelson",
+                                      "America/Fort_Wayne",
+                                      "America/Fortaleza",
+                                      "America/Glace_Bay",
+                                      "America/Godthab",
+                                      "America/Goose_Bay",
+                                      "America/Grand_Turk",
+                                      "America/Grenada",
+                                      "America/Guadeloupe",
+                                      "America/Guatemala",
+                                      "America/Guayaquil",
+                                      "America/Guyana",
+                                      "America/Halifax",
+                                      "America/Havana",
+                                      "America/Hermosillo",
+                                      "America/Indiana/Indianapolis",
+                                      "America/Indiana/Knox",
+                                      "America/Indiana/Marengo",
+                                      "America/Indiana/Petersburg",
+                                      "America/Indiana/Tell_City",
+                                      "America/Indiana/Vevay",
+                                      "America/Indiana/Vincennes",
+                                      "America/Indiana/Winamac",
+                                      "America/Indianapolis",
+                                      "America/Inuvik",
+                                      "America/Iqaluit",
+                                      "America/Jamaica",
+                                      "America/Jujuy",
+                                      "America/Juneau",
+                                      "America/Kentucky/Louisville",
+                                      "America/Kentucky/Monticello",
+                                      "America/Knox_IN",
+                                      "America/Kralendijk",
+                                      "America/La_Paz",
+                                      "America/Lima",
+                                      "America/Los_Angeles",
+                                      "America/Louisville",
+                                      "America/Lower_Princes",
+                                      "America/Maceio",
+                                      "America/Managua",
+                                      "America/Manaus",
+                                      "America/Marigot",
+                                      "America/Martinique",
+                                      "America/Matamoros",
+                                      "America/Mazatlan",
+                                      "America/Mendoza",
+                                      "America/Menominee",
+                                      "America/Merida",
+                                      "America/Metlakatla",
+                                      "America/Mexico_City",
+                                      "America/Miquelon",
+                                      "America/Moncton",
+                                      "America/Monterrey",
+                                      "America/Montevideo",
+                                      "America/Montreal",
+                                      "America/Montserrat",
+                                      "America/Nassau",
+                                      "America/New_York",
+                                      "America/Nipigon",
+                                      "America/Nome",
+                                      "America/Noronha",
+                                      "America/North_Dakota/Beulah",
+                                      "America/North_Dakota/Center",
+                                      "America/North_Dakota/New_Salem",
+                                      "America/Ojinaga",
+                                      "America/Panama",
+                                      "America/Pangnirtung",
+                                      "America/Paramaribo",
+                                      "America/Phoenix",
+                                      "America/Port-au-Prince",
+                                      "America/Port_of_Spain",
+                                      "America/Porto_Acre",
+                                      "America/Porto_Velho",
+                                      "America/Puerto_Rico",
+                                      "America/Punta_Arenas",
+                                      "America/Rainy_River",
+                                      "America/Rankin_Inlet",
+                                      "America/Recife",
+                                      "America/Regina",
+                                      "America/Resolute",
+                                      "America/Rio_Branco",
+                                      "America/Rosario",
+                                      "America/Santa_Isabel",
+                                      "America/Santarem",
+                                      "America/Santiago",
+                                      "America/Santo_Domingo",
+                                      "America/Sao_Paulo",
+                                      "America/Scoresbysund",
+                                      "America/Shiprock",
+                                      "America/Sitka",
+                                      "America/St_Barthelemy",
+                                      "America/St_Johns",
+                                      "America/St_Kitts",
+                                      "America/St_Lucia",
+                                      "America/St_Thomas",
+                                      "America/St_Vincent",
+                                      "America/Swift_Current",
+                                      "America/Tegucigalpa",
+                                      "America/Thule",
+                                      "America/Thunder_Bay",
+                                      "America/Tijuana",
+                                      "America/Toronto",
+                                      "America/Tortola",
+                                      "America/Vancouver",
+                                      "America/Virgin",
+                                      "America/Whitehorse",
+                                      "America/Winnipeg",
+                                      "America/Yakutat",
+                                      "America/Yellowknife",
+                                      "Antarctica/Casey",
+                                      "Antarctica/Davis",
+                                      "Antarctica/DumontDUrville",
+                                      "Antarctica/Macquarie",
+                                      "Antarctica/Mawson",
+                                      "Antarctica/McMurdo",
+                                      "Antarctica/Palmer",
+                                      "Antarctica/Rothera",
+                                      "Antarctica/South_Pole",
+                                      "Antarctica/Syowa",
+                                      "Antarctica/Troll",
+                                      "Antarctica/Vostok",
+                                      "Arctic/Longyearbyen",
+                                      "Asia/Aden",
+                                      "Asia/Almaty",
+                                      "Asia/Amman",
+                                      "Asia/Anadyr",
+                                      "Asia/Aqtau",
+                                      "Asia/Aqtobe",
+                                      "Asia/Ashgabat",
+                                      "Asia/Ashkhabad",
+                                      "Asia/Atyrau",
+                                      "Asia/Baghdad",
+                                      "Asia/Bahrain",
+                                      "Asia/Baku",
+                                      "Asia/Bangkok",
+                                      "Asia/Barnaul",
+                                      "Asia/Beirut",
+                                      "Asia/Bishkek",
+                                      "Asia/Brunei",
+                                      "Asia/Calcutta",
+                                      "Asia/Chita",
+                                      "Asia/Choibalsan",
+                                      "Asia/Chongqing",
+                                      "Asia/Chungking",
+                                      "Asia/Colombo",
+                                      "Asia/Dacca",
+                                      "Asia/Damascus",
+                                      "Asia/Dhaka",
+                                      "Asia/Dili",
+                                      "Asia/Dubai",
+                                      "Asia/Dushanbe",
+                                      "Asia/Famagusta",
+                                      "Asia/Gaza",
+                                      "Asia/Harbin",
+                                      "Asia/Hebron",
+                                      "Asia/Ho_Chi_Minh",
+                                      "Asia/Hong_Kong",
+                                      "Asia/Hovd",
+                                      "Asia/Irkutsk",
+                                      "Asia/Istanbul",
+                                      "Asia/Jakarta",
+                                      "Asia/Jayapura",
+                                      "Asia/Jerusalem",
+                                      "Asia/Kabul",
+                                      "Asia/Kamchatka",
+                                      "Asia/Karachi",
+                                      "Asia/Kashgar",
+                                      "Asia/Kathmandu",
+                                      "Asia/Katmandu",
+                                      "Asia/Khandyga",
+                                      "Asia/Kolkata",
+                                      "Asia/Krasnoyarsk",
+                                      "Asia/Kuala_Lumpur",
+                                      "Asia/Kuching",
+                                      "Asia/Kuwait",
+                                      "Asia/Macao",
+                                      "Asia/Macau",
+                                      "Asia/Magadan",
+                                      "Asia/Makassar",
+                                      "Asia/Manila",
+                                      "Asia/Muscat",
+                                      "Asia/Nicosia",
+                                      "Asia/Novokuznetsk",
+                                      "Asia/Novosibirsk",
+                                      "Asia/Omsk",
+                                      "Asia/Oral",
+                                      "Asia/Phnom_Penh",
+                                      "Asia/Pontianak",
+                                      "Asia/Pyongyang",
+                                      "Asia/Qatar",
+                                      "Asia/Qostanay",
+                                      "Asia/Qyzylorda",
+                                      "Asia/Rangoon",
+                                      "Asia/Riyadh",
+                                      "Asia/Saigon",
+                                      "Asia/Sakhalin",
+                                      "Asia/Samarkand",
+                                      "Asia/Seoul",
+                                      "Asia/Shanghai",
+                                      "Asia/Singapore",
+                                      "Asia/Srednekolymsk",
+                                      "Asia/Taipei",
+                                      "Asia/Tashkent",
+                                      "Asia/Tbilisi",
+                                      "Asia/Tehran",
+                                      "Asia/Tel_Aviv",
+                                      "Asia/Thimbu",
+                                      "Asia/Thimphu",
+                                      "Asia/Tokyo",
+                                      "Asia/Tomsk",
+                                      "Asia/Ujung_Pandang",
+                                      "Asia/Ulaanbaatar",
+                                      "Asia/Ulan_Bator",
+                                      "Asia/Urumqi",
+                                      "Asia/Ust-Nera",
+                                      "Asia/Vientiane",
+                                      "Asia/Vladivostok",
+                                      "Asia/Yakutsk",
+                                      "Asia/Yangon",
+                                      "Asia/Yekaterinburg",
+                                      "Asia/Yerevan",
+                                      "Atlantic/Azores",
+                                      "Atlantic/Bermuda",
+                                      "Atlantic/Canary",
+                                      "Atlantic/Cape_Verde",
+                                      "Atlantic/Faeroe",
+                                      "Atlantic/Faroe",
+                                      "Atlantic/Jan_Mayen",
+                                      "Atlantic/Madeira",
+                                      "Atlantic/Reykjavik",
+                                      "Atlantic/South_Georgia",
+                                      "Atlantic/St_Helena",
+                                      "Atlantic/Stanley",
+                                      "Australia/ACT",
+                                      "Australia/Adelaide",
+                                      "Australia/Brisbane",
+                                      "Australia/Broken_Hill",
+                                      "Australia/Canberra",
+                                      "Australia/Currie",
+                                      "Australia/Darwin",
+                                      "Australia/Eucla",
+                                      "Australia/Hobart",
+                                      "Australia/LHI",
+                                      "Australia/Lindeman",
+                                      "Australia/Lord_Howe",
+                                      "Australia/Melbourne",
+                                      "Australia/NSW",
+                                      "Australia/North",
+                                      "Australia/Perth",
+                                      "Australia/Queensland",
+                                      "Australia/South",
+                                      "Australia/Sydney",
+                                      "Australia/Tasmania",
+                                      "Australia/Victoria",
+                                      "Australia/West",
+                                      "Australia/Yancowinna",
+                                      "Brazil/Acre",
+                                      "Brazil/DeNoronha",
+                                      "Brazil/East",
+                                      "Brazil/West",
+                                      "CET",
+                                      "CST6CDT",
+                                      "Canada/Atlantic",
+                                      "Canada/Central",
+                                      "Canada/Eastern",
+                                      "Canada/Mountain",
+                                      "Canada/Newfoundland",
+                                      "Canada/Pacific",
+                                      "Canada/Saskatchewan",
+                                      "Canada/Yukon",
+                                      "Chile/Continental",
+                                      "Chile/EasterIsland",
+                                      "Cuba",
+                                      "EET",
+                                      "EST",
+                                      "EST5EDT",
+                                      "Egypt",
+                                      "Eire",
+                                      "Etc/GMT",
+                                      "Etc/GMT+0",
+                                      "Etc/GMT+1",
+                                      "Etc/GMT+10",
+                                      "Etc/GMT+11",
+                                      "Etc/GMT+12",
+                                      "Etc/GMT+2",
+                                      "Etc/GMT+3",
+                                      "Etc/GMT+4",
+                                      "Etc/GMT+5",
+                                      "Etc/GMT+6",
+                                      "Etc/GMT+7",
+                                      "Etc/GMT+8",
+                                      "Etc/GMT+9",
+                                      "Etc/GMT-0",
+                                      "Etc/GMT-1",
+                                      "Etc/GMT-10",
+                                      "Etc/GMT-11",
+                                      "Etc/GMT-12",
+                                      "Etc/GMT-13",
+                                      "Etc/GMT-14",
+                                      "Etc/GMT-2",
+                                      "Etc/GMT-3",
+                                      "Etc/GMT-4",
+                                      "Etc/GMT-5",
+                                      "Etc/GMT-6",
+                                      "Etc/GMT-7",
+                                      "Etc/GMT-8",
+                                      "Etc/GMT-9",
+                                      "Etc/GMT0",
+                                      "Etc/Greenwich",
+                                      "Etc/UCT",
+                                      "Etc/UTC",
+                                      "Etc/Universal",
+                                      "Etc/Zulu",
+                                      "Europe/Amsterdam",
+                                      "Europe/Andorra",
+                                      "Europe/Astrakhan",
+                                      "Europe/Athens",
+                                      "Europe/Belfast",
+                                      "Europe/Belgrade",
+                                      "Europe/Berlin",
+                                      "Europe/Bratislava",
+                                      "Europe/Brussels",
+                                      "Europe/Bucharest",
+                                      "Europe/Budapest",
+                                      "Europe/Busingen",
+                                      "Europe/Chisinau",
+                                      "Europe/Copenhagen",
+                                      "Europe/Dublin",
+                                      "Europe/Gibraltar",
+                                      "Europe/Guernsey",
+                                      "Europe/Helsinki",
+                                      "Europe/Isle_of_Man",
+                                      "Europe/Istanbul",
+                                      "Europe/Jersey",
+                                      "Europe/Kaliningrad",
+                                      "Europe/Kiev",
+                                      "Europe/Kirov",
+                                      "Europe/Lisbon",
+                                      "Europe/Ljubljana",
+                                      "Europe/London",
+                                      "Europe/Luxembourg",
+                                      "Europe/Madrid",
+                                      "Europe/Malta",
+                                      "Europe/Mariehamn",
+                                      "Europe/Minsk",
+                                      "Europe/Monaco",
+                                      "Europe/Moscow",
+                                      "Europe/Nicosia",
+                                      "Europe/Oslo",
+                                      "Europe/Paris",
+                                      "Europe/Podgorica",
+                                      "Europe/Prague",
+                                      "Europe/Riga",
+                                      "Europe/Rome",
+                                      "Europe/Samara",
+                                      "Europe/San_Marino",
+                                      "Europe/Sarajevo",
+                                      "Europe/Saratov",
+                                      "Europe/Simferopol",
+                                      "Europe/Skopje",
+                                      "Europe/Sofia",
+                                      "Europe/Stockholm",
+                                      "Europe/Tallinn",
+                                      "Europe/Tirane",
+                                      "Europe/Tiraspol",
+                                      "Europe/Ulyanovsk",
+                                      "Europe/Uzhgorod",
+                                      "Europe/Vaduz",
+                                      "Europe/Vatican",
+                                      "Europe/Vienna",
+                                      "Europe/Vilnius",
+                                      "Europe/Volgograd",
+                                      "Europe/Warsaw",
+                                      "Europe/Zagreb",
+                                      "Europe/Zaporozhye",
+                                      "Europe/Zurich",
+                                      "GB",
+                                      "GB-Eire",
+                                      "GMT",
+                                      "GMT+0",
+                                      "GMT-0",
+                                      "GMT0",
+                                      "Greenwich",
+                                      "HST",
+                                      "Hongkong",
+                                      "Iceland",
+                                      "Indian/Antananarivo",
+                                      "Indian/Chagos",
+                                      "Indian/Christmas",
+                                      "Indian/Cocos",
+                                      "Indian/Comoro",
+                                      "Indian/Kerguelen",
+                                      "Indian/Mahe",
+                                      "Indian/Maldives",
+                                      "Indian/Mauritius",
+                                      "Indian/Mayotte",
+                                      "Indian/Reunion",
+                                      "Iran",
+                                      "Israel",
+                                      "Jamaica",
+                                      "Japan",
+                                      "Kwajalein",
+                                      "Libya",
+                                      "MET",
+                                      "MST",
+                                      "MST7MDT",
+                                      "Mexico/BajaNorte",
+                                      "Mexico/BajaSur",
+                                      "Mexico/General",
+                                      "NZ",
+                                      "NZ-CHAT",
+                                      "Navajo",
+                                      "PRC",
+                                      "PST8PDT",
+                                      "Pacific/Apia",
+                                      "Pacific/Auckland",
+                                      "Pacific/Bougainville",
+                                      "Pacific/Chatham",
+                                      "Pacific/Chuuk",
+                                      "Pacific/Easter",
+                                      "Pacific/Efate",
+                                      "Pacific/Enderbury",
+                                      "Pacific/Fakaofo",
+                                      "Pacific/Fiji",
+                                      "Pacific/Funafuti",
+                                      "Pacific/Galapagos",
+                                      "Pacific/Gambier",
+                                      "Pacific/Guadalcanal",
+                                      "Pacific/Guam",
+                                      "Pacific/Honolulu",
+                                      "Pacific/Johnston",
+                                      "Pacific/Kiritimati",
+                                      "Pacific/Kosrae",
+                                      "Pacific/Kwajalein",
+                                      "Pacific/Majuro",
+                                      "Pacific/Marquesas",
+                                      "Pacific/Midway",
+                                      "Pacific/Nauru",
+                                      "Pacific/Niue",
+                                      "Pacific/Norfolk",
+                                      "Pacific/Noumea",
+                                      "Pacific/Pago_Pago",
+                                      "Pacific/Palau",
+                                      "Pacific/Pitcairn",
+                                      "Pacific/Pohnpei",
+                                      "Pacific/Ponape",
+                                      "Pacific/Port_Moresby",
+                                      "Pacific/Rarotonga",
+                                      "Pacific/Saipan",
+                                      "Pacific/Samoa",
+                                      "Pacific/Tahiti",
+                                      "Pacific/Tarawa",
+                                      "Pacific/Tongatapu",
+                                      "Pacific/Truk",
+                                      "Pacific/Wake",
+                                      "Pacific/Wallis",
+                                      "Pacific/Yap",
+                                      "Poland",
+                                      "Portugal",
+                                      "ROC",
+                                      "ROK",
+                                      "Singapore",
+                                      "Turkey",
+                                      "UCT",
+                                      "US/Alaska",
+                                      "US/Aleutian",
+                                      "US/Arizona",
+                                      "US/Central",
+                                      "US/East-Indiana",
+                                      "US/Eastern",
+                                      "US/Hawaii",
+                                      "US/Indiana-Starke",
+                                      "US/Michigan",
+                                      "US/Mountain",
+                                      "US/Pacific",
+                                      "US/Samoa",
+                                      "UTC",
+                                      "Universal",
+                                      "W-SU",
+                                      "WET",
+                                      "Zulu",
+                                      nullptr};
 
 // Helper to return a loaded time zone by value (UTC on error).
 time_zone LoadZone(const std::string& name) {
@@ -724,7 +723,8 @@ TEST(TimeZone, NamedTimeZones) {
   EXPECT_EQ("America/New_York", nyc.name());
   const time_zone syd = LoadZone("Australia/Sydney");
   EXPECT_EQ("Australia/Sydney", syd.name());
-  const time_zone fixed0 = fixed_time_zone(absl::time_internal::cctz::seconds::zero());
+  const time_zone fixed0 =
+      fixed_time_zone(absl::time_internal::cctz::seconds::zero());
   EXPECT_EQ("UTC", fixed0.name());
   const time_zone fixed_pos = fixed_time_zone(
       chrono::hours(3) + chrono::minutes(25) + chrono::seconds(45));
@@ -767,7 +767,8 @@ TEST(TimeZone, Equality) {
   EXPECT_EQ(implicit_utc, explicit_utc);
   EXPECT_EQ(implicit_utc.name(), explicit_utc.name());
 
-  const time_zone fixed_zero = fixed_time_zone(absl::time_internal::cctz::seconds::zero());
+  const time_zone fixed_zero =
+      fixed_time_zone(absl::time_internal::cctz::seconds::zero());
   EXPECT_EQ(fixed_zero, LoadZone(fixed_zero.name()));
   EXPECT_EQ(fixed_zero, explicit_utc);
 
@@ -806,8 +807,8 @@ TEST(TimeZone, Equality) {
 TEST(StdChronoTimePoint, TimeTAlignment) {
   // Ensures that the Unix epoch and the system clock epoch are an integral
   // number of seconds apart. This simplifies conversions to/from time_t.
-  auto diff = chrono::system_clock::time_point() -
-              chrono::system_clock::from_time_t(0);
+  auto diff =
+      chrono::system_clock::time_point() - chrono::system_clock::from_time_t(0);
   EXPECT_EQ(chrono::system_clock::time_point::duration::zero(),
             diff % chrono::seconds(1));
 }
@@ -816,20 +817,20 @@ TEST(BreakTime, TimePointResolution) {
   const time_zone utc = utc_time_zone();
   const auto t0 = chrono::system_clock::from_time_t(0);
 
-  ExpectTime(chrono::time_point_cast<chrono::nanoseconds>(t0), utc,
-             1970, 1, 1, 0, 0, 0, 0, false, "UTC");
-  ExpectTime(chrono::time_point_cast<chrono::microseconds>(t0), utc,
-             1970, 1, 1, 0, 0, 0, 0, false, "UTC");
-  ExpectTime(chrono::time_point_cast<chrono::milliseconds>(t0), utc,
-             1970, 1, 1, 0, 0, 0, 0, false, "UTC");
-  ExpectTime(chrono::time_point_cast<chrono::seconds>(t0), utc,
-             1970, 1, 1, 0, 0, 0, 0, false, "UTC");
-  ExpectTime(chrono::time_point_cast<absl::time_internal::cctz::seconds>(t0), utc,
-             1970, 1, 1, 0, 0, 0, 0, false, "UTC");
-  ExpectTime(chrono::time_point_cast<chrono::minutes>(t0), utc,
-             1970, 1, 1, 0, 0, 0, 0, false, "UTC");
-  ExpectTime(chrono::time_point_cast<chrono::hours>(t0), utc,
-             1970, 1, 1, 0, 0, 0, 0, false, "UTC");
+  ExpectTime(chrono::time_point_cast<chrono::nanoseconds>(t0), utc, 1970, 1, 1,
+             0, 0, 0, 0, false, "UTC");
+  ExpectTime(chrono::time_point_cast<chrono::microseconds>(t0), utc, 1970, 1, 1,
+             0, 0, 0, 0, false, "UTC");
+  ExpectTime(chrono::time_point_cast<chrono::milliseconds>(t0), utc, 1970, 1, 1,
+             0, 0, 0, 0, false, "UTC");
+  ExpectTime(chrono::time_point_cast<chrono::seconds>(t0), utc, 1970, 1, 1, 0,
+             0, 0, 0, false, "UTC");
+  ExpectTime(chrono::time_point_cast<absl::time_internal::cctz::seconds>(t0),
+             utc, 1970, 1, 1, 0, 0, 0, 0, false, "UTC");
+  ExpectTime(chrono::time_point_cast<chrono::minutes>(t0), utc, 1970, 1, 1, 0,
+             0, 0, 0, false, "UTC");
+  ExpectTime(chrono::time_point_cast<chrono::hours>(t0), utc, 1970, 1, 1, 0, 0,
+             0, 0, false, "UTC");
 }
 
 TEST(BreakTime, LocalTimeInUTC) {
@@ -911,9 +912,8 @@ TEST(MakeTime, TimePointResolution) {
       chrono::time_point_cast<chrono::minutes>(
           convert(civil_second(2015, 1, 2, 3, 4, 5), utc));
   EXPECT_EQ("04:00", format("%M:%E*S", tp_m, utc));
-  const time_point<chrono::hours> tp_h =
-      chrono::time_point_cast<chrono::hours>(
-          convert(civil_second(2015, 1, 2, 3, 4, 5), utc));
+  const time_point<chrono::hours> tp_h = chrono::time_point_cast<chrono::hours>(
+      convert(civil_second(2015, 1, 2, 3, 4, 5), utc));
   EXPECT_EQ("00:00", format("%M:%E*S", tp_h, utc));
 }
 
@@ -932,7 +932,7 @@ TEST(MakeTime, Normalization) {
 
 // NOTE: Run this with -ftrapv to detect overflow problems.
 TEST(MakeTime, SysSecondsLimits) {
-  const char RFC3339[] =  "%Y-%m-%dT%H:%M:%S%Ez";
+  const char RFC3339[] = "%Y-%m-%dT%H:%M:%S%Ez";
   const time_zone utc = utc_time_zone();
   const time_zone east = fixed_time_zone(chrono::hours(14));
   const time_zone west = fixed_time_zone(-chrono::hours(14));
@@ -1030,8 +1030,7 @@ TEST(MakeTime, LocalTimeLibC) {
     const auto lc = LoadZone("libc:localtime");
     time_zone::civil_transition trans;
     for (auto tp = zi.lookup(civil_second()).trans;
-         zi.next_transition(tp, &trans);
-         tp = zi.lookup(trans.to).trans) {
+         zi.next_transition(tp, &trans); tp = zi.lookup(trans.to).trans) {
       const auto fcl = zi.lookup(trans.from);
       const auto tcl = zi.lookup(trans.to);
       civil_second cs;  // compare cs in zi and lc
@@ -1433,4 +1432,5 @@ TEST(TimeZoneEdgeCase, UTC5DigitYear) {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/time_zone_posix.cc b/absl/time/internal/cctz/src/time_zone_posix.cc
index 038740e1..5cdd09e8 100644
--- a/absl/time/internal/cctz/src/time_zone_posix.cc
+++ b/absl/time/internal/cctz/src/time_zone_posix.cc
@@ -19,7 +19,10 @@
 #include <limits>
 #include <string>
 
+#include "absl/base/config.h"
+
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -152,4 +155,5 @@ bool ParsePosixSpec(const std::string& spec, PosixTimeZone* res) {
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/time/internal/cctz/src/time_zone_posix.h b/absl/time/internal/cctz/src/time_zone_posix.h
index 6a60022f..0cf29055 100644
--- a/absl/time/internal/cctz/src/time_zone_posix.h
+++ b/absl/time/internal/cctz/src/time_zone_posix.h
@@ -55,7 +55,10 @@
 #include <cstdint>
 #include <string>
 
+#include "absl/base/config.h"
+
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -123,6 +126,7 @@ bool ParsePosixSpec(const std::string& spec, PosixTimeZone* res);
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_POSIX_H_
diff --git a/absl/time/internal/cctz/src/tzfile.h b/absl/time/internal/cctz/src/tzfile.h
index 51b1f1f3..1ed55e0f 100644
--- a/absl/time/internal/cctz/src/tzfile.h
+++ b/absl/time/internal/cctz/src/tzfile.h
@@ -22,36 +22,35 @@
 */
 
 #ifndef TZDIR
-#define TZDIR	"/usr/share/zoneinfo" /* Time zone object file directory */
-#endif /* !defined TZDIR */
+#define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */
+#endif                              /* !defined TZDIR */
 
 #ifndef TZDEFAULT
-#define TZDEFAULT	"/etc/localtime"
+#define TZDEFAULT "/etc/localtime"
 #endif /* !defined TZDEFAULT */
 
 #ifndef TZDEFRULES
-#define TZDEFRULES	"posixrules"
+#define TZDEFRULES "posixrules"
 #endif /* !defined TZDEFRULES */
 
-
 /* See Internet RFC 8536 for more details about the following format.  */
 
 /*
 ** Each file begins with. . .
 */
 
-#define	TZ_MAGIC	"TZif"
+#define TZ_MAGIC "TZif"
 
 struct tzhead {
-	char	tzh_magic[4];		/* TZ_MAGIC */
-	char	tzh_version[1];		/* '\0' or '2' or '3' as of 2013 */
-	char	tzh_reserved[15];	/* reserved; must be zero */
-	char	tzh_ttisutcnt[4];	/* coded number of trans. time flags */
-	char	tzh_ttisstdcnt[4];	/* coded number of trans. time flags */
-	char	tzh_leapcnt[4];		/* coded number of leap seconds */
-	char	tzh_timecnt[4];		/* coded number of transition times */
-	char	tzh_typecnt[4];		/* coded number of local time types */
-	char	tzh_charcnt[4];		/* coded number of abbr. chars */
+  char tzh_magic[4];      /* TZ_MAGIC */
+  char tzh_version[1];    /* '\0' or '2' or '3' as of 2013 */
+  char tzh_reserved[15];  /* reserved; must be zero */
+  char tzh_ttisutcnt[4];  /* coded number of trans. time flags */
+  char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
+  char tzh_leapcnt[4];    /* coded number of leap seconds */
+  char tzh_timecnt[4];    /* coded number of transition times */
+  char tzh_typecnt[4];    /* coded number of local time types */
+  char tzh_charcnt[4];    /* coded number of abbr. chars */
 };
 
 /*
@@ -103,21 +102,21 @@ struct tzhead {
 */
 
 #ifndef TZ_MAX_TIMES
-#define TZ_MAX_TIMES	2000
+#define TZ_MAX_TIMES 2000
 #endif /* !defined TZ_MAX_TIMES */
 
 #ifndef TZ_MAX_TYPES
 /* This must be at least 17 for Europe/Samara and Europe/Vilnius.  */
-#define TZ_MAX_TYPES	256 /* Limited by what (unsigned char)'s can hold */
-#endif /* !defined TZ_MAX_TYPES */
+#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
+#endif                   /* !defined TZ_MAX_TYPES */
 
 #ifndef TZ_MAX_CHARS
-#define TZ_MAX_CHARS	50	/* Maximum number of abbreviation characters */
-				/* (limited by what unsigned chars can hold) */
-#endif /* !defined TZ_MAX_CHARS */
+#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
+                        /* (limited by what unsigned chars can hold) */
+#endif                  /* !defined TZ_MAX_CHARS */
 
 #ifndef TZ_MAX_LEAPS
-#define TZ_MAX_LEAPS	50	/* Maximum number of leap second corrections */
-#endif /* !defined TZ_MAX_LEAPS */
+#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
+#endif                  /* !defined TZ_MAX_LEAPS */
 
 #endif /* !defined TZFILE_H */
diff --git a/absl/time/internal/cctz/src/zone_info_source.cc b/absl/time/internal/cctz/src/zone_info_source.cc
index d5758efa..619ac1fb 100644
--- a/absl/time/internal/cctz/src/zone_info_source.cc
+++ b/absl/time/internal/cctz/src/zone_info_source.cc
@@ -14,7 +14,10 @@
 
 #include "absl/time/internal/cctz/include/cctz/zone_info_source.h"
 
+#include "absl/base/config.h"
+
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
@@ -24,9 +27,11 @@ std::string ZoneInfoSource::Version() const { return std::string(); }
 
 }  // namespace cctz
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl
 
 namespace absl {
+ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz_extension {
 
@@ -36,8 +41,9 @@ namespace {
 // defers to the fallback factory.
 std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource> DefaultFactory(
     const std::string& name,
-    const std::function<std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource>(
-        const std::string& name)>& fallback_factory) {
+    const std::function<
+        std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource>(
+            const std::string& name)>& fallback_factory) {
   return fallback_factory(name);
 }
 
@@ -53,8 +59,8 @@ std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource> DefaultFactory(
 // Windows linker cannot handle that. Nor does the MinGW compiler know how to
 // pass "#pragma comment(linker, ...)" to the Windows linker.
 #if (__has_attribute(weak) || defined(__GNUC__)) && !defined(__MINGW32__)
-ZoneInfoSourceFactory zone_info_source_factory
-    __attribute__((weak)) = DefaultFactory;
+ZoneInfoSourceFactory zone_info_source_factory __attribute__((weak)) =
+    DefaultFactory;
 #elif defined(_MSC_VER) && !defined(__MINGW32__) && !defined(_LIBCPP_VERSION)
 extern ZoneInfoSourceFactory zone_info_source_factory;
 extern ZoneInfoSourceFactory default_factory;
@@ -77,4 +83,5 @@ ZoneInfoSourceFactory zone_info_source_factory = DefaultFactory;
 
 }  // namespace cctz_extension
 }  // namespace time_internal
+ABSL_NAMESPACE_END
 }  // namespace absl