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Diffstat (limited to 'absl/time/civil_time.cc')
-rw-r--r-- | absl/time/civil_time.cc | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/absl/time/civil_time.cc b/absl/time/civil_time.cc new file mode 100644 index 00000000..c6fa5469 --- /dev/null +++ b/absl/time/civil_time.cc @@ -0,0 +1,90 @@ +// 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 +// +// http://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/time/civil_time.h" + +#include <cstdlib> +#include <string> + +#include "absl/strings/str_cat.h" +#include "absl/time/time.h" + +namespace absl { +inline namespace lts_2018_12_18 { + +namespace { + +// Since a civil time has a larger year range than absl::Time (64-bit years vs +// 64-bit seconds, respectively) we normalize years to roughly +/- 400 years +// around the year 2400, which will produce an equivalent year in a range that +// absl::Time can handle. +inline civil_year_t NormalizeYear(civil_year_t year) { + return 2400 + year % 400; +} + +// Formats the given CivilSecond according to the given format. +std::string FormatYearAnd(string_view fmt, CivilSecond cs) { + const CivilSecond ncs(NormalizeYear(cs.year()), cs.month(), cs.day(), + cs.hour(), cs.minute(), cs.second()); + const TimeZone utc = UTCTimeZone(); + // TODO(absl-team): Avoid conversion of fmt std::string. + return StrCat(cs.year(), FormatTime(std::string(fmt), FromCivil(ncs, utc), utc)); +} + +} // namespace + +std::string FormatCivilTime(CivilSecond c) { + return FormatYearAnd("-%m-%dT%H:%M:%S", c); +} +std::string FormatCivilTime(CivilMinute c) { + return FormatYearAnd("-%m-%dT%H:%M", c); +} +std::string FormatCivilTime(CivilHour c) { + return FormatYearAnd("-%m-%dT%H", c); +} +std::string FormatCivilTime(CivilDay c) { + return FormatYearAnd("-%m-%d", c); +} +std::string FormatCivilTime(CivilMonth c) { + return FormatYearAnd("-%m", c); +} +std::string FormatCivilTime(CivilYear c) { + return FormatYearAnd("", c); +} + +namespace time_internal { + +std::ostream& operator<<(std::ostream& os, CivilYear y) { + return os << FormatCivilTime(y); +} +std::ostream& operator<<(std::ostream& os, CivilMonth m) { + return os << FormatCivilTime(m); +} +std::ostream& operator<<(std::ostream& os, CivilDay d) { + return os << FormatCivilTime(d); +} +std::ostream& operator<<(std::ostream& os, CivilHour h) { + return os << FormatCivilTime(h); +} +std::ostream& operator<<(std::ostream& os, CivilMinute m) { + return os << FormatCivilTime(m); +} +std::ostream& operator<<(std::ostream& os, CivilSecond s) { + return os << FormatCivilTime(s); +} + +} // namespace time_internal + +} // inline namespace lts_2018_12_18 +} // namespace absl |