72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/*
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* Copyright 2007-2020 CM4all GmbH
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* All rights reserved.
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*
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* author: Max Kellermann <mk@cm4all.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <chrono>
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struct tm;
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/**
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* Calculates the preceding midnight time point in the current time
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* zone.
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*/
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[[gnu::const]]
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std::chrono::system_clock::time_point
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PrecedingMidnightLocal(std::chrono::system_clock::time_point t) noexcept;
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/**
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* Calculate the end of the current month (i.e. midnight on the 1st of
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* the following month). Does NOT keeps the tm_wday and tm_yday
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* attributes updated, and ignores day light saving transitions.
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*/
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void
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EndOfMonth(struct tm &tm) noexcept;
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/**
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* Calculate the next day, keeping month/year wraparounds and leap
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* days in mind. Keeps the tm_wday attribute updated, but not other
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* derived attributes such as tm_yday, and ignores day light saving
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* transitions.
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*/
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void
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IncrementDay(struct tm &tm) noexcept;
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/**
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* Calculate the previous day, keeping month/year wraparounds and leap
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* days in mind. Keeps the tm_wday attribute updated, but not other
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* derived attributes such as tm_yday, and ignores day light saving
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* transitions.
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*/
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void
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DecrementDay(struct tm &tm) noexcept;
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