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