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35 lines
834 B
C
35 lines
834 B
C
/* $Id$ */
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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 BASE_YEAR 1920
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#define MIN_YEAR 1920
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#define MAX_YEAR 2090
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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 ConvertDateToYMD(Date date, YearMonthDay *ymd);
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Date ConvertYMDToDate(Year year, Month month, Day day);
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