1 #define DIFFTIME 0x19db1ded53e8000ULL 2 #define DIFFDAYS (3 * DAYSPER100YEARS + 17 * DAYSPER4YEARS + 1 * DAYSPERYEAR) 3 4 #define DAYSPERYEAR 365 5 #define DAYSPER4YEARS (4*DAYSPERYEAR+1) 6 #define DAYSPER100YEARS (25*DAYSPER4YEARS-1) 7 #define DAYSPER400YEARS (4*DAYSPER100YEARS+1) 8 #define SECONDSPERDAY (24*60*60) 9 #define SECONDSPERHOUR (60*60) 10 #define LEAPDAY 59 11 12 static __inline 13 __time64_t FileTimeToUnixTime(const FILETIME * FileTime,USHORT * millitm)14FileTimeToUnixTime(const FILETIME *FileTime, USHORT *millitm) 15 { 16 ULARGE_INTEGER ULargeInt; 17 __time64_t time; 18 19 ULargeInt.LowPart = FileTime->dwLowDateTime; 20 ULargeInt.HighPart = FileTime->dwHighDateTime; 21 ULargeInt.QuadPart -= DIFFTIME; 22 23 time = ULargeInt.QuadPart / 10000000; 24 if (millitm) 25 *millitm = (USHORT)((ULargeInt.QuadPart % 10000000) / 10000); 26 27 return time; 28 } 29 30 static __inline leapyears_passed(long days)31long leapyears_passed(long days) 32 { 33 long quadcenturies, centuries, quadyears; 34 quadcenturies = days / DAYSPER400YEARS; 35 days -= quadcenturies; 36 centuries = days / DAYSPER100YEARS; 37 days += centuries; 38 quadyears = days / DAYSPER4YEARS; 39 return quadyears - centuries + quadcenturies; 40 } 41 42 static __inline leapdays_passed(long days)43long leapdays_passed(long days) 44 { 45 return leapyears_passed(days + DAYSPERYEAR - LEAPDAY + 1); 46 } 47 48 static __inline years_passed(long days)49long years_passed(long days) 50 { 51 return (days - leapdays_passed(days)) / 365; 52 } 53 54 extern long dst_begin; 55 extern long dst_end; 56