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/* $Id$ */

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/**

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 * 1 day is 74 ticks; _date_fract used to be uint16 and incremented by 885. On

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 *                    an overflow the new day begun and 65535 / 885 = 74.

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 * 1 tick is approximately 30 ms.

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 * 1 day is thus about 2 seconds (74 * 30 = 2220) on a machine that can run OpenTTD normally

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 */

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#define DAY_TICKS 74

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#define MAX_YEAR_BEGIN_REAL 1920

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#define MAX_YEAR_END_REAL 2090

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#define MAX_YEAR_END 170

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/* Year and Date are defined elsewhere */

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typedef uint8  Month;

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typedef uint8  Day;

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typedef uint16 DateFract;

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typedef struct YearMonthDay {

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	Year  year;

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	Month month;

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	Day   day;

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} YearMonthDay;

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extern Year      _cur_year;

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extern Month     _cur_month;

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extern Date      _date;

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extern DateFract _date_fract;

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void SetDate(Date date);

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void ConvertDayToYMD(YearMonthDay *ymd, Date date);

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uint ConvertYMDToDay(Year year, Month month, Day day);

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Date ConvertIntDate(uint date);