time_zone_fixed.h (2091B)
1 // Copyright 2016 Google Inc. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_FIXED_H_ 16 #define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_FIXED_H_ 17 18 #include <string> 19 20 #include "absl/base/config.h" 21 #include "absl/time/internal/cctz/include/cctz/time_zone.h" 22 23 namespace absl { 24 ABSL_NAMESPACE_BEGIN 25 namespace time_internal { 26 namespace cctz { 27 28 // Helper functions for dealing with the names and abbreviations 29 // of time zones that are a fixed offset (seconds east) from UTC. 30 // FixedOffsetFromName() extracts the offset from a valid fixed-offset 31 // name, while FixedOffsetToName() and FixedOffsetToAbbr() generate 32 // the canonical zone name and abbreviation respectively for the given 33 // offset. 34 // 35 // A fixed-offset name looks like "Fixed/UTC<+-><hours>:<mins>:<secs>". 36 // Its abbreviation is of the form "UTC(<+->H?H(MM(SS)?)?)?" where the 37 // optional pieces are omitted when their values are zero. (Note that 38 // the sign is the opposite of that used in a POSIX TZ specification.) 39 // 40 // Note: FixedOffsetFromName() fails on syntax errors or when the parsed 41 // offset exceeds 24 hours. FixedOffsetToName() and FixedOffsetToAbbr() 42 // both produce "UTC" when the argument offset exceeds 24 hours. 43 bool FixedOffsetFromName(const std::string& name, seconds* offset); 44 std::string FixedOffsetToName(const seconds& offset); 45 std::string FixedOffsetToAbbr(const seconds& offset); 46 47 } // namespace cctz 48 } // namespace time_internal 49 ABSL_NAMESPACE_END 50 } // namespace absl 51 52 #endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_FIXED_H_