rubidium@4261: /* $Id$ */
rubidium@4261: 
rubidium@4261: /**
rubidium@4261:  * 1 day is 74 ticks; _date_fract used to be uint16 and incremented by 885. On
rubidium@4261:  *                    an overflow the new day begun and 65535 / 885 = 74.
rubidium@4261:  * 1 tick is approximately 30 ms.
rubidium@4261:  * 1 day is thus about 2 seconds (74 * 30 = 2220) on a machine that can run OpenTTD normally
rubidium@4261:  */
rubidium@4261: #define DAY_TICKS 74
rubidium@4261: 
rubidium@4286: #define BASE_YEAR 1920
rubidium@4286: #define MIN_YEAR 1920
rubidium@4286: #define MAX_YEAR 2090
rubidium@4261: 
rubidium@4261: /* Year and Date are defined elsewhere */
rubidium@4261: typedef uint8  Month;
rubidium@4261: typedef uint8  Day;
rubidium@4261: typedef uint16 DateFract;
rubidium@4261: 
rubidium@4261: typedef struct YearMonthDay {
rubidium@4261: 	Year  year;
rubidium@4261: 	Month month;
rubidium@4261: 	Day   day;
rubidium@4261: } YearMonthDay;
rubidium@4261: 
rubidium@4261: extern Year      _cur_year;
rubidium@4261: extern Month     _cur_month;
rubidium@4261: extern Date      _date;
rubidium@4261: extern DateFract _date_fract;
rubidium@4261: 
rubidium@4261: 
rubidium@4261: void SetDate(Date date);
rubidium@4288: void ConvertDateToYMD(Date date, YearMonthDay *ymd);
rubidium@4288: Date ConvertYMDToDate(Year year, Month month, Day day);
rubidium@4261: Date ConvertIntDate(uint date);