# ai_date.cpp

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    00001 /* $Id$ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * 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.
    00006  * 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.
    00007  * 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/>.
    00008  */
    00009
    00012 #include "../../stdafx.h"
    00013 #include "ai_date.hpp"
    00014 #include "../../date_func.h"
    00015
    00016 /* static */ int32 AIDate::GetCurrentDate()
    00017 {
    00018   return ::_date;
    00019 }
    00020
    00021 /* static */ int32 AIDate::GetYear(int32 date)
    00022 {
    00023   if (date < 0) return -1;
    00024
    00025 	::YearMonthDay ymd;
    00026 	::ConvertDateToYMD(date, &ymd);
    00027   return ymd.year;
    00028 }
    00029
    00030 /* static */ int32 AIDate::GetMonth(int32 date)
    00031 {
    00032   if (date < 0) return -1;
    00033
    00034 	::YearMonthDay ymd;
    00035 	::ConvertDateToYMD(date, &ymd);
    00036   return ymd.month + 1;
    00037 }
    00038
    00039 /* static */ int32 AIDate::GetDayOfMonth(int32 date)
    00040 {
    00041   if (date < 0) return -1;
    00042
    00043 	::YearMonthDay ymd;
    00044 	::ConvertDateToYMD(date, &ymd);
    00045   return ymd.day;
    00046 }
    00047
    00048 /* static */ int32 AIDate::GetDate(int32 year, int32 month, int32 day_of_month)
    00049 {
    00050   if (month < 1 || month > 12) return -1;
    00051   if (day_of_month < 1 || day_of_month > 31) return -1;
    00052   if (year < 0 || year > MAX_YEAR) return -1;
    00053
    00054   return ::ConvertYMDToDate(year, month - 1, day_of_month);
    00055 }