mirror of
https://github.com/HowardHinnant/date.git
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82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) 2017 Howard Hinnant
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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// Test custom time zone support
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#include "tz.h"
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class OffsetZone
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{
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std::chrono::minutes offset_;
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public:
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explicit OffsetZone(std::chrono::minutes offset)
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: offset_{offset}
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{}
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template <class Duration>
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auto
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to_local(date::sys_time<Duration> tp) const
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{
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using namespace date;
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using namespace std::chrono;
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using LT = local_time<std::common_type_t<Duration, minutes>>;
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return LT{(tp + offset_).time_since_epoch()};
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}
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template <class Duration>
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auto
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to_sys(date::local_time<Duration> tp) const
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{
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using namespace date;
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using namespace std::chrono;
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using ST = sys_time<std::common_type_t<Duration, minutes>>;
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return ST{(tp - offset_).time_since_epoch()};
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}
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template <class Duration>
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date::sys_info
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get_info(date::sys_time<Duration> st) const
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{
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using namespace date;
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using namespace std::chrono;
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return {sys_seconds::min(), sys_seconds::max(), offset_,
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minutes{0}, offset_ >= minutes{0} ? "+" + date::format("%H%M", offset_)
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: "-" + date::format("%H%M", -offset_)};
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}
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const OffsetZone* operator->() const {return this;}
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};
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#include <cassert>
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int
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main()
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{
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using namespace date;
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using namespace std::chrono;
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auto now = system_clock::now();
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auto offset = hours{-4};
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zoned_time<system_clock::duration, OffsetZone> zt{OffsetZone{offset}, now};
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assert(zt.get_local_time().time_since_epoch() == now.time_since_epoch() + offset);
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}
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