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56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
#define DIFFTIME 0x19db1ded53e8000ULL
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#define DIFFDAYS (3 * DAYSPER100YEARS + 17 * DAYSPER4YEARS + 1 * DAYSPERYEAR)
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#define DAYSPERYEAR 365
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#define DAYSPER4YEARS (4*DAYSPERYEAR+1)
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#define DAYSPER100YEARS (25*DAYSPER4YEARS-1)
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#define DAYSPER400YEARS (4*DAYSPER100YEARS+1)
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#define SECONDSPERDAY (24*60*60)
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#define SECONDSPERHOUR (60*60)
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#define LEAPDAY 59
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static __inline
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__time64_t
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FileTimeToUnixTime(const FILETIME *FileTime, USHORT *millitm)
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{
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ULARGE_INTEGER ULargeInt;
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__time64_t time;
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ULargeInt.LowPart = FileTime->dwLowDateTime;
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ULargeInt.HighPart = FileTime->dwHighDateTime;
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ULargeInt.QuadPart -= DIFFTIME;
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time = ULargeInt.QuadPart / 10000000;
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if (millitm)
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*millitm = (USHORT)((ULargeInt.QuadPart % 10000000) / 10000);
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return time;
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}
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static __inline
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long leapyears_passed(long days)
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{
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long quadcenturies, centuries, quadyears;
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quadcenturies = days / DAYSPER400YEARS;
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days -= quadcenturies;
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centuries = days / DAYSPER100YEARS;
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days += centuries;
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quadyears = days / DAYSPER4YEARS;
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return quadyears - centuries + quadcenturies;
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}
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static __inline
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long leapdays_passed(long days)
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{
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return leapyears_passed(days + DAYSPERYEAR - LEAPDAY + 1);
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}
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static __inline
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long years_passed(long days)
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{
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return (days - leapdays_passed(days)) / 365;
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}
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extern long dst_begin;
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extern long dst_end;
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