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