Export of internal Abseil changes.

--
7fa1107161a03dac53fb84c2b06d8092616c7b13 by Abseil Team <absl-team@google.com>:

Harden the generic stacktrace implementation for use during early program execution

PiperOrigin-RevId: 226375950

--
079f9969329f5eb66f647dd3c44b17541b1bf217 by Matt Kulukundis <kfm@google.com>:

Workaround platforms that have over-aggressive warnings on -Wexit-time-destructors

PiperOrigin-RevId: 226362948

--
1447943f509be681ca5495add0162c750ef237f1 by Matt Kulukundis <kfm@google.com>:

Switch from 64 to size_t atomics so they work on embedded platforms that do not
have 64 bit atomics.

PiperOrigin-RevId: 226210704

--
d14d49837ae2bcde74051e0c79c18ee0f43866b9 by Tom Manshreck <shreck@google.com>:

Develop initial documentation for API breaking changes process:

PiperOrigin-RevId: 226210021

--
7ea3d7fe0e86979dab83a5fc9cc3bf1d6cb3bd53 by Abseil Team <absl-team@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 226195522

--
7de873e880d7f016a4fa1e08d626f0535cc470af by Abseil Team <absl-team@google.com>:

Make Abseil LICENSE files newline terminated, with a single
trailing blank line.  Also remove line-ending whitespace.

PiperOrigin-RevId: 226182949

--
7d00643fadfad7f0d992c68bd9d2ed2e5bc960b0 by Matt Kulukundis <kfm@google.com>:

Internal cleanup

PiperOrigin-RevId: 226045282

--
c4a0a11c0ce2875271191e477f3d36eaaeca4613 by Matt Kulukundis <kfm@google.com>:

Internal cleanup

PiperOrigin-RevId: 226038273

--
8ee4ebbb1ae5cda119e436e5ff7e3aa966608c10 by Matt Kulukundis <kfm@google.com>:

Adds a global sampler which tracks a fraction of live tables for collecting
telemetry data.

PiperOrigin-RevId: 226032080

--
d576446f050518cd1b0ae447d682d8552f0e7e30 by Mark Barolak <mbar@google.com>:

Replace an internal CaseEqual function with calls to the identical absl::EqualsIgnoreCase.  This closes out a rather old TODO.

PiperOrigin-RevId: 226024779

--
6b23f1ee028a5ffa608c920424f1220a117a8f3d by Abseil Team <absl-team@google.com>:

Add December 2018 LTS branch to list of LTS branches.

PiperOrigin-RevId: 226011333

--
bb0833a43bdaef4c8c059b17bcd27ba9a085a114 by Mark Barolak <mbar@google.com>:

Explicitly state that when the SimpleAtoi family of functions encounter an error, the value of their output parameter is unspecified.

Also standardize the name of the output parameter to be `out`.

PiperOrigin-RevId: 225997035

--
46c1876b1a248eabda7545daa61a74a4cdfe9077 by Abseil Team <absl-team@google.com>:

Remove deprecated CMake function absl_test, absl_library and absl_header_library

PiperOrigin-RevId: 225950041
GitOrigin-RevId: 7fa1107161a03dac53fb84c2b06d8092616c7b13
Change-Id: I2ca9d3aada9292614527d1339a7557494139b806

1 files changed, 209 insertions, 135 deletions

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 6b9928e..cd0ae23 100644
--- a/absl/time/internal/cctz/src/time_zone_format_test.cc
+++ b/absl/time/internal/cctz/src/time_zone_format_test.cc
@@ -436,51 +436,165 @@ TEST(Format, CompareExtendSecondsVsSubseconds) {
 }
 
 TEST(Format, ExtendedOffset) {
-  auto tp = chrono::system_clock::from_time_t(0);
+  const auto tp = chrono::system_clock::from_time_t(0);
 
-  time_zone tz = utc_time_zone();
+  auto tz = fixed_time_zone(absl::time_internal::cctz::seconds::zero());
+  TestFormatSpecifier(tp, tz, "%z", "+0000");
+  TestFormatSpecifier(tp, tz, "%:z", "+00:00");
   TestFormatSpecifier(tp, tz, "%Ez", "+00:00");
 
-  EXPECT_TRUE(load_time_zone("America/New_York", &tz));
-  TestFormatSpecifier(tp, tz, "%Ez", "-05:00");
-
-  EXPECT_TRUE(load_time_zone("America/Los_Angeles", &tz));
-  TestFormatSpecifier(tp, tz, "%Ez", "-08:00");
+  tz = fixed_time_zone(chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%z", "+0000");
+  TestFormatSpecifier(tp, tz, "%:z", "+00:00");
+  TestFormatSpecifier(tp, tz, "%Ez", "+00:00");
 
-  EXPECT_TRUE(load_time_zone("Australia/Sydney", &tz));
-  TestFormatSpecifier(tp, tz, "%Ez", "+10:00");
+  tz = fixed_time_zone(-chrono::seconds(56));  // NOTE: +00:00
+  TestFormatSpecifier(tp, tz, "%z", "+0000");
+  TestFormatSpecifier(tp, tz, "%:z", "+00:00");
+  TestFormatSpecifier(tp, tz, "%Ez", "+00:00");
 
-  EXPECT_TRUE(load_time_zone("Africa/Monrovia", &tz));
-  // The true offset is -00:44:30 but %z only gives (truncated) minutes.
-  TestFormatSpecifier(tp, tz, "%z", "-0044");
-  TestFormatSpecifier(tp, tz, "%Ez", "-00:44");
+  tz = fixed_time_zone(chrono::minutes(34));
+  TestFormatSpecifier(tp, tz, "%z", "+0034");
+  TestFormatSpecifier(tp, tz, "%:z", "+00:34");
+  TestFormatSpecifier(tp, tz, "%Ez", "+00:34");
+
+  tz = fixed_time_zone(-chrono::minutes(34));
+  TestFormatSpecifier(tp, tz, "%z", "-0034");
+  TestFormatSpecifier(tp, tz, "%:z", "-00:34");
+  TestFormatSpecifier(tp, tz, "%Ez", "-00:34");
+
+  tz = fixed_time_zone(chrono::minutes(34) + chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%z", "+0034");
+  TestFormatSpecifier(tp, tz, "%:z", "+00:34");
+  TestFormatSpecifier(tp, tz, "%Ez", "+00:34");
+
+  tz = fixed_time_zone(-chrono::minutes(34) - chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%z", "-0034");
+  TestFormatSpecifier(tp, tz, "%:z", "-00:34");
+  TestFormatSpecifier(tp, tz, "%Ez", "-00:34");
+
+  tz = fixed_time_zone(chrono::hours(12));
+  TestFormatSpecifier(tp, tz, "%z", "+1200");
+  TestFormatSpecifier(tp, tz, "%:z", "+12:00");
+  TestFormatSpecifier(tp, tz, "%Ez", "+12:00");
+
+  tz = fixed_time_zone(-chrono::hours(12));
+  TestFormatSpecifier(tp, tz, "%z", "-1200");
+  TestFormatSpecifier(tp, tz, "%:z", "-12:00");
+  TestFormatSpecifier(tp, tz, "%Ez", "-12:00");
+
+  tz = fixed_time_zone(chrono::hours(12) + chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%z", "+1200");
+  TestFormatSpecifier(tp, tz, "%:z", "+12:00");
+  TestFormatSpecifier(tp, tz, "%Ez", "+12:00");
+
+  tz = fixed_time_zone(-chrono::hours(12) - chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%z", "-1200");
+  TestFormatSpecifier(tp, tz, "%:z", "-12:00");
+  TestFormatSpecifier(tp, tz, "%Ez", "-12:00");
+
+  tz = fixed_time_zone(chrono::hours(12) + chrono::minutes(34));
+  TestFormatSpecifier(tp, tz, "%z", "+1234");
+  TestFormatSpecifier(tp, tz, "%:z", "+12:34");
+  TestFormatSpecifier(tp, tz, "%Ez", "+12:34");
+
+  tz = fixed_time_zone(-chrono::hours(12) - chrono::minutes(34));
+  TestFormatSpecifier(tp, tz, "%z", "-1234");
+  TestFormatSpecifier(tp, tz, "%:z", "-12:34");
+  TestFormatSpecifier(tp, tz, "%Ez", "-12:34");
+
+  tz = fixed_time_zone(chrono::hours(12) + chrono::minutes(34) +
+                       chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%z", "+1234");
+  TestFormatSpecifier(tp, tz, "%:z", "+12:34");
+  TestFormatSpecifier(tp, tz, "%Ez", "+12:34");
+
+  tz = fixed_time_zone(-chrono::hours(12) - chrono::minutes(34) -
+                       chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%z", "-1234");
+  TestFormatSpecifier(tp, tz, "%:z", "-12:34");
+  TestFormatSpecifier(tp, tz, "%Ez", "-12:34");
 }
 
 TEST(Format, ExtendedSecondOffset) {
-  const time_zone utc = utc_time_zone();
-  time_point<chrono::seconds> tp;
-  time_zone tz;
-
-  EXPECT_TRUE(load_time_zone("America/New_York", &tz));
-  tp = convert(civil_second(1883, 11, 18, 16, 59, 59), utc);
-  if (tz.lookup(tp).offset == -5 * 60 * 60) {
-    // It looks like the tzdata is only 32 bit (probably macOS),
-    // which bottoms out at 1901-12-13T20:45:52+00:00.
-  } else {
-    TestFormatSpecifier(tp, tz, "%E*z", "-04:56:02");
-    TestFormatSpecifier(tp, tz, "%Ez", "-04:56");
-  }
-  tp += chrono::seconds(1);
-  TestFormatSpecifier(tp, tz, "%E*z", "-05:00:00");
-
-  EXPECT_TRUE(load_time_zone("Europe/Moscow", &tz));
-  tp = convert(civil_second(1919, 6, 30, 23, 59, 59), utc);
-  if (VersionCmp(tz, "2016g") >= 0) {
-    TestFormatSpecifier(tp, tz, "%E*z", "+04:31:19");
-    TestFormatSpecifier(tp, tz, "%Ez", "+04:31");
-  }
-  tp += chrono::seconds(1);
-  TestFormatSpecifier(tp, tz, "%E*z", "+04:00:00");
+  const auto tp = chrono::system_clock::from_time_t(0);
+
+  auto tz = fixed_time_zone(absl::time_internal::cctz::seconds::zero());
+  TestFormatSpecifier(tp, tz, "%E*z", "+00:00:00");
+  TestFormatSpecifier(tp, tz, "%::z", "+00:00:00");
+  TestFormatSpecifier(tp, tz, "%:::z", "+00");
+
+  tz = fixed_time_zone(chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%E*z", "+00:00:56");
+  TestFormatSpecifier(tp, tz, "%::z", "+00:00:56");
+  TestFormatSpecifier(tp, tz, "%:::z", "+00:00:56");
+
+  tz = fixed_time_zone(-chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%E*z", "-00:00:56");
+  TestFormatSpecifier(tp, tz, "%::z", "-00:00:56");
+  TestFormatSpecifier(tp, tz, "%:::z", "-00:00:56");
+
+  tz = fixed_time_zone(chrono::minutes(34));
+  TestFormatSpecifier(tp, tz, "%E*z", "+00:34:00");
+  TestFormatSpecifier(tp, tz, "%::z", "+00:34:00");
+  TestFormatSpecifier(tp, tz, "%:::z", "+00:34");
+
+  tz = fixed_time_zone(-chrono::minutes(34));
+  TestFormatSpecifier(tp, tz, "%E*z", "-00:34:00");
+  TestFormatSpecifier(tp, tz, "%::z", "-00:34:00");
+  TestFormatSpecifier(tp, tz, "%:::z", "-00:34");
+
+  tz = fixed_time_zone(chrono::minutes(34) + chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%E*z", "+00:34:56");
+  TestFormatSpecifier(tp, tz, "%::z", "+00:34:56");
+  TestFormatSpecifier(tp, tz, "%:::z", "+00:34:56");
+
+  tz = fixed_time_zone(-chrono::minutes(34) - chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%E*z", "-00:34:56");
+  TestFormatSpecifier(tp, tz, "%::z", "-00:34:56");
+  TestFormatSpecifier(tp, tz, "%:::z", "-00:34:56");
+
+  tz = fixed_time_zone(chrono::hours(12));
+  TestFormatSpecifier(tp, tz, "%E*z", "+12:00:00");
+  TestFormatSpecifier(tp, tz, "%::z", "+12:00:00");
+  TestFormatSpecifier(tp, tz, "%:::z", "+12");
+
+  tz = fixed_time_zone(-chrono::hours(12));
+  TestFormatSpecifier(tp, tz, "%E*z", "-12:00:00");
+  TestFormatSpecifier(tp, tz, "%::z", "-12:00:00");
+  TestFormatSpecifier(tp, tz, "%:::z", "-12");
+
+  tz = fixed_time_zone(chrono::hours(12) + chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%E*z", "+12:00:56");
+  TestFormatSpecifier(tp, tz, "%::z", "+12:00:56");
+  TestFormatSpecifier(tp, tz, "%:::z", "+12:00:56");
+
+  tz = fixed_time_zone(-chrono::hours(12) - chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%E*z", "-12:00:56");
+  TestFormatSpecifier(tp, tz, "%::z", "-12:00:56");
+  TestFormatSpecifier(tp, tz, "%:::z", "-12:00:56");
+
+  tz = fixed_time_zone(chrono::hours(12) + chrono::minutes(34));
+  TestFormatSpecifier(tp, tz, "%E*z", "+12:34:00");
+  TestFormatSpecifier(tp, tz, "%::z", "+12:34:00");
+  TestFormatSpecifier(tp, tz, "%:::z", "+12:34");
+
+  tz = fixed_time_zone(-chrono::hours(12) - chrono::minutes(34));
+  TestFormatSpecifier(tp, tz, "%E*z", "-12:34:00");
+  TestFormatSpecifier(tp, tz, "%::z", "-12:34:00");
+  TestFormatSpecifier(tp, tz, "%:::z", "-12:34");
+
+  tz = fixed_time_zone(chrono::hours(12) + chrono::minutes(34) +
+                       chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%E*z", "+12:34:56");
+  TestFormatSpecifier(tp, tz, "%::z", "+12:34:56");
+  TestFormatSpecifier(tp, tz, "%:::z", "+12:34:56");
+
+  tz = fixed_time_zone(-chrono::hours(12) - chrono::minutes(34) -
+                       chrono::seconds(56));
+  TestFormatSpecifier(tp, tz, "%E*z", "-12:34:56");
+  TestFormatSpecifier(tp, tz, "%::z", "-12:34:56");
+  TestFormatSpecifier(tp, tz, "%:::z", "-12:34:56");
 }
 
 TEST(Format, ExtendedYears) {
@@ -1160,25 +1274,6 @@ TEST(Parse, ExtendedOffset) {
   const time_zone utc = utc_time_zone();
   time_point<absl::time_internal::cctz::seconds> tp;
 
-  // %z against +-HHMM.
-  EXPECT_TRUE(parse("%z", "+0000", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%z", "-1234", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 0), utc), tp);
-  EXPECT_TRUE(parse("%z", "+1234", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
-  EXPECT_FALSE(parse("%z", "-123", utc, &tp));
-
-  // %z against +-HH.
-  EXPECT_TRUE(parse("%z", "+00", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%z", "-12", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%z", "+12", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1969, 12, 31, 12, 0, 0), utc), tp);
-  EXPECT_FALSE(parse("%z", "-1", utc, &tp));
-
-  // %Ez against +-HH:MM.
   EXPECT_TRUE(parse("%Ez", "+00:00", utc, &tp));
   EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
   EXPECT_TRUE(parse("%Ez", "-12:34", utc, &tp));
@@ -1187,91 +1282,70 @@ TEST(Parse, ExtendedOffset) {
   EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
   EXPECT_FALSE(parse("%Ez", "-12:3", utc, &tp));
 
-  // %Ez against +-HHMM.
-  EXPECT_TRUE(parse("%Ez", "+0000", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%Ez", "-1234", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 0), utc), tp);
-  EXPECT_TRUE(parse("%Ez", "+1234", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
-  EXPECT_FALSE(parse("%Ez", "-123", utc, &tp));
-
-  // %Ez against +-HH.
-  EXPECT_TRUE(parse("%Ez", "+00", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%Ez", "-12", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%Ez", "+12", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1969, 12, 31, 12, 0, 0), utc), tp);
-  EXPECT_FALSE(parse("%Ez", "-1", utc, &tp));
+  for (auto fmt : {"%Ez", "%z"}) {
+    EXPECT_TRUE(parse(fmt, "+0000", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "-1234", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "+1234", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
+    EXPECT_FALSE(parse(fmt, "-123", utc, &tp));
+
+    EXPECT_TRUE(parse(fmt, "+00", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "-12", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 0, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "+12", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1969, 12, 31, 12, 0, 0), utc), tp);
+    EXPECT_FALSE(parse(fmt, "-1", utc, &tp));
+  }
 }
 
 TEST(Parse, ExtendedSecondOffset) {
   const time_zone utc = utc_time_zone();
   time_point<absl::time_internal::cctz::seconds> tp;
 
-  // %Ez against +-HH:MM:SS.
-  EXPECT_TRUE(parse("%Ez", "+00:00:00", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%Ez", "-12:34:56", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 56), utc), tp);
-  EXPECT_TRUE(parse("%Ez", "+12:34:56", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 25, 4), utc), tp);
-  EXPECT_FALSE(parse("%Ez", "-12:34:5", utc, &tp));
-
-  // %Ez against +-HHMMSS.
-  EXPECT_TRUE(parse("%Ez", "+000000", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%Ez", "-123456", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 56), utc), tp);
-  EXPECT_TRUE(parse("%Ez", "+123456", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 25, 4), utc), tp);
-  EXPECT_FALSE(parse("%Ez", "-12345", utc, &tp));
-
-  // %E*z against +-HH:MM:SS.
-  EXPECT_TRUE(parse("%E*z", "+00:00:00", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%E*z", "-12:34:56", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 56), utc), tp);
-  EXPECT_TRUE(parse("%E*z", "+12:34:56", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 25, 4), utc), tp);
-  EXPECT_FALSE(parse("%E*z", "-12:34:5", utc, &tp));
-
-  // %E*z against +-HHMMSS.
-  EXPECT_TRUE(parse("%E*z", "+000000", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%E*z", "-123456", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 56), utc), tp);
-  EXPECT_TRUE(parse("%E*z", "+123456", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 25, 4), utc), tp);
-  EXPECT_FALSE(parse("%E*z", "-12345", utc, &tp));
-
-  // %E*z against +-HH:MM.
-  EXPECT_TRUE(parse("%E*z", "+00:00", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%E*z", "-12:34", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 0), utc), tp);
-  EXPECT_TRUE(parse("%E*z", "+12:34", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
-  EXPECT_FALSE(parse("%E*z", "-12:3", utc, &tp));
-
-  // %E*z against +-HHMM.
-  EXPECT_TRUE(parse("%E*z", "+0000", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%E*z", "-1234", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 0), utc), tp);
-  EXPECT_TRUE(parse("%E*z", "+1234", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
-  EXPECT_FALSE(parse("%E*z", "-123", utc, &tp));
-
-  // %E*z against +-HH.
-  EXPECT_TRUE(parse("%E*z", "+00", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%E*z", "-12", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 0, 0), utc), tp);
-  EXPECT_TRUE(parse("%E*z", "+12", utc, &tp));
-  EXPECT_EQ(convert(civil_second(1969, 12, 31, 12, 0, 0), utc), tp);
-  EXPECT_FALSE(parse("%E*z", "-1", utc, &tp));
+  for (auto fmt : {"%Ez", "%E*z", "%:z", "%::z", "%:::z"}) {
+    EXPECT_TRUE(parse(fmt, "+00:00:00", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "-12:34:56", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 56), utc), tp);
+    EXPECT_TRUE(parse(fmt, "+12:34:56", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 25, 4), utc), tp);
+    EXPECT_FALSE(parse(fmt, "-12:34:5", utc, &tp));
+
+    EXPECT_TRUE(parse(fmt, "+000000", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "-123456", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 56), utc), tp);
+    EXPECT_TRUE(parse(fmt, "+123456", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 25, 4), utc), tp);
+    EXPECT_FALSE(parse(fmt, "-12345", utc, &tp));
+
+    EXPECT_TRUE(parse(fmt, "+00:00", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "-12:34", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "+12:34", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
+    EXPECT_FALSE(parse(fmt, "-12:3", utc, &tp));
+
+    EXPECT_TRUE(parse(fmt, "+0000", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "-1234", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 34, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "+1234", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1969, 12, 31, 11, 26, 0), utc), tp);
+    EXPECT_FALSE(parse(fmt, "-123", utc, &tp));
+
+    EXPECT_TRUE(parse(fmt, "+00", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 0, 0, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "-12", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1970, 1, 1, 12, 0, 0), utc), tp);
+    EXPECT_TRUE(parse(fmt, "+12", utc, &tp));
+    EXPECT_EQ(convert(civil_second(1969, 12, 31, 12, 0, 0), utc), tp);
+    EXPECT_FALSE(parse(fmt, "-1", utc, &tp));
+  }
 }
 
 TEST(Parse, ExtendedYears) {