cpp/openttd-patchpack/source Files · date.h

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r4261:8c2d0c75e37a 886 B text/x-c Show Annotation Show as Raw Download as Raw

rubidium

(svn r5887) -Cleanup: move date related functions, defines and variables to date.[ch]
-Cleanup: fix whitespace related coding style issues in date.[ch]
-Cleanup: make original comments doxygen compatible and remove/change outdated comments

/* $Id$ */

/**
 * 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);