// 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/time/civil_time.h"
#include <cstdlib>
#include <string>
#include "absl/strings/str_cat.h"
#include "absl/time/time.h"
namespace absl {
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
} // namespace absl
