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/* $Id$ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file ai_date.hpp Everything to query and manipulate date related information. */
#ifndef AI_DATE_HPP
#define AI_DATE_HPP
#include "ai_object.hpp"
/**
* Class that handles all date related (calculation) functions.
*
* @note Months and days of month are 1-based; the first month of the
* year is 1 and the first day of the month is also 1.
* @note Years are zero based; they start with the year 0.
* @note Dates can be used to determine the number of days between
* two different moments in time because they count the number
* of days since the year 0.
*/
class AIDate : public AIObject {
public:
static const char *GetClassName() { return "AIDate"; }
/**
* Get the current date.
* This is the number of days since epoch under the assumption that
* there is a leap year every 4 years, except when dividable by
* 100 but not by 400.
* @return The current date.
*/
static int32 GetCurrentDate();
/**
* Get the year of the given date.
* @param date The date to get the year of.
* @return The year.
*/
static int32 GetYear(int32 date);
/**
* Get the month of the given date.
* @param date The date to get the month of.
* @return The month.
*/
static int32 GetMonth(int32 date);
/**
* Get the day (of the month) of the given date.
* @param date The date to get the day of.
* @return The day.
*/
static int32 GetDayOfMonth(int32 date);
/**
* Get the date given a year, month and day of month.
* @param year The year of the to-be determined date.
* @param month The month of the to-be determined date.
* @param day_of_month The day of month of the to-be determined date.
* @return The date.
*/
static int32 GetDate(int32 year, int32 month, int32 day_of_month);
};
#endif /* AI_DATE_HPP */
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