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46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file date_func.h Functions related to dates. */
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#ifndef DATE_FUNC_H
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#define DATE_FUNC_H
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#include "date_type.h"
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extern Year _cur_year;
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extern Month _cur_month;
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extern YearMonthDay _cur_date_ymd;
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extern Date _date;
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extern DateFract _date_fract;
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extern uint16 _tick_counter;
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extern uint8 _tick_skip_counter;
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extern uint32 _scaled_tick_counter;
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extern DateTicksScaled _scaled_date_ticks;
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extern uint32 _quit_after_days;
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void SetDate(Date date, DateFract fract);
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void ConvertDateToYMD(Date date, YearMonthDay *ymd);
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Date ConvertYMDToDate(Year year, Month month, Day day);
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void SetScaledTickVariables();
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#define YMD_TO_DATE(ymd) (ConvertYMDToDate(ymd.year, ymd.month, ymd.day))
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/**
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* Checks whether the given year is a leap year or not.
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* @param yr The year to check.
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* @return True if \c yr is a leap year, otherwise false.
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*/
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static inline bool IsLeapYear(Year yr)
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{
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return yr % 4 == 0 && (yr % 100 != 0 || yr % 400 == 0);
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}
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#endif /* DATE_FUNC_H */
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