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 #ifndef DATE_TYPE_H 00013 #define DATE_TYPE_H 00014 00021 enum { 00022 DAY_TICKS = 74, 00023 DAYS_IN_YEAR = 365, 00024 DAYS_IN_LEAP_YEAR = 366, 00025 }; 00026 00027 /* 00028 * ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR and DAYS_TILL_ORIGINAL_BASE_YEAR are 00029 * primarily used for loading newgrf and savegame data and returning some 00030 * newgrf (callback) functions that were in the original (TTD) inherited 00031 * format, where '_date == 0' meant that it was 1920-01-01. 00032 */ 00033 00035 #define ORIGINAL_BASE_YEAR 1920 00036 00037 #define ORIGINAL_END_YEAR 2051 00038 00039 #define ORIGINAL_MAX_YEAR 2090 00040 00053 #define LEAP_YEARS_TILL(year) ((year) == 0 ? 0 : ((year) - 1) / 4 - ((year) - 1) / 100 + ((year) - 1) / 400 + 1) 00054 00060 #define DAYS_TILL(year) (DAYS_IN_YEAR * (year) + LEAP_YEARS_TILL(year)) 00061 00066 #define DAYS_TILL_ORIGINAL_BASE_YEAR DAYS_TILL(ORIGINAL_BASE_YEAR) 00067 00069 #define MIN_YEAR 0 00070 00072 #define DEF_START_YEAR 1950 00073 00078 #define MAX_YEAR 5000000 00079 00081 #define MAX_DAY (DAYS_TILL(MAX_YEAR + 1) - 1) 00082 00083 typedef int32 Date; 00084 typedef uint16 DateFract; 00085 typedef int32 Ticks; 00086 00087 typedef int32 Year; 00088 typedef uint8 Month; 00089 typedef uint8 Day; 00090 00095 struct YearMonthDay { 00096 Year year; 00097 Month month; 00098 Day day; 00099 }; 00100 00101 static const Year INVALID_YEAR = -1; 00102 static const Date INVALID_DATE = -1; 00103 static const Ticks INVALID_TICKS = -1; 00104 00105 #endif /* DATE_TYPE_H */