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Windows FILETIME 与UNIX时间的转换

windows FILETIME时间从1601/01/01 零时零分零秒开始计时,windows每个时钟滴答将计数加一,每个时钟滴答的间隔是100 nanoseconds(纳秒,1秒=10的九次方纳秒),即每个时钟滴答= 10 (-7)秒。

unix、linux时间是从1970/01/01零时零分零秒开始计数,每秒计数加1. 197001/01与1601/01/01的时间间隔是11644473600秒。

所以从windows滴答时间转化为unix时间的代码为:

#define WINDOWS_TICK 10000000  //10的7次方#define SEC_TO_UNIX_EPOCH 11644473600LL //1601与1970的时间间隔unsigned WindowsTickToUnixSeconds(long long windowsTicks){     return (unsigned)(windowsTicks / WINDOWS_TICK - SEC_TO_UNIX_EPOCH);}

 从timeval转化为FILETIME的代码为:

void FileTimeToTimeval(FILETIME *pFileTime, struct timeval *pTimeval){    CalcOffsetFrom1601To1970(); //11644473600LL*10^7    ULONGLONG ul64FileTime = 0;     ul64FileTime |= pFileTime->dwHighDateTime;    ul64FileTime <<= 32;    ul64FileTime |= pFileTime->dwLowDateTime;     ul64FileTime -= g_ullOffsetFrom1601To1970;    pTimeval->tv_sec = (long)(ul64FileTime / 10000000);    pTimeval->tv_usec = (long)((ul64FileTime % 10000000) / 10);}	void TimevalToFileTime(struct timeval *pTimeval, FILETIME *pFileTime){    CalcOffsetFrom1601To1970();    ULONGLONG x = pTimeval->tv_sec * NSPERSEC + pTimeval->tv_usec * 10;    x += g_ullOffsetFrom1601To1970;    pFileTime->dwHighDateTime = (ULONG)(x >> 32);    pFileTime->dwLowDateTime = (ULONG)x;}

 

Windows FILETIME 与UNIX时间的转换