# date_type.h

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    00001 /* $Id: date_type.h 11702 2007-12-26 13:50:40Z rubidium $ */
    00002
    00005 #ifndef DATE_TYPE_H
    00006 #define DATE_TYPE_H
    00007
    00014 #define DAY_TICKS 74
    00015
    00016 /*
    00017  * ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR and DAYS_TILL_ORIGINAL_BASE_YEAR are
    00018  * primarily used for loading newgrf and savegame data and returning some
    00019  * newgrf (callback) functions that were in the original (TTD) inherited
    00020  * format, where '_date == 0' meant that it was 1920-01-01.
    00021  */
    00022
    00024 #define ORIGINAL_BASE_YEAR 1920
    00025
    00026 #define ORIGINAL_MAX_YEAR 2090
    00027
    00032 #define DAYS_TILL_ORIGINAL_BASE_YEAR (365 * ORIGINAL_BASE_YEAR + ORIGINAL_BASE_YEAR / 4 - ORIGINAL_BASE_YEAR / 100 + ORIGINAL_BASE_YEAR / 400)
    00033
    00034 /* The absolute minimum & maximum years in OTTD */
    00035 #define MIN_YEAR 0
    00036 /* MAX_YEAR, nicely rounded value of the number of years that can
    00037  * be encoded in a single 32 bits date, about 2^31 / 366 years. */
    00038 #define MAX_YEAR 5000000
    00039
    00040 typedef int32  Date;
    00041 typedef uint16 DateFract;
    00042
    00043 typedef int32  Year;
    00044 typedef uint8  Month;
    00045 typedef uint8  Day;
    00046
    00047 struct YearMonthDay {
    00048   Year  year;
    00049   Month month;
    00050   Day   day;
    00051 };
    00052
    00053 static const Year INVALID_YEAR = -1;
    00054 static const Date INVALID_DATE = -1;
    00055
    00056 #endif /* DATE_TYPE_H */