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/* $Id$ */
/**
* 1 day is 74 ticks; _date_fract used to be uint16 and incremented by 885. On
* an overflow the new day begun and 65535 / 885 = 74.
* 1 tick is approximately 30 ms.
* 1 day is thus about 2 seconds (74 * 30 = 2220) on a machine that can run OpenTTD normally
*/
#define DAY_TICKS 74
#define MAX_YEAR_BEGIN_REAL 1920
#define MAX_YEAR_END_REAL 2090
#define MAX_YEAR_END 170
/* Year and Date are defined elsewhere */
typedef uint8 Month;
typedef uint8 Day;
typedef uint16 DateFract;
typedef struct YearMonthDay {
Year year;
Month month;
Day day;
} YearMonthDay;
extern Year _cur_year;
extern Month _cur_month;
extern Date _date;
extern DateFract _date_fract;
void SetDate(Date date);
void ConvertDayToYMD(YearMonthDay *ymd, Date date);
uint ConvertYMDToDay(Year year, Month month, Day day);
Date ConvertIntDate(uint date);
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