Conversion of Windows FILETIME to Unix time

Windows filetime time starts from 1601/01/01 to 0 minutes and 0 seconds, windows each clock tick will count plus one, each clock tick interval is nanoseconds (nanosecond, 1 seconds =10 Nine square nanoseconds), that is, each clock tick = 10 (-7) seconds.

UNIX, Linux time is counting from 1970/01/01 to 0 minutes and 0 seconds, counting plus 1 per second. The time interval between 197001/01 and 1601/01/01 is 11,644,473,600 seconds.

So the code to convert from Windows tick time to Unix time is:

#define Windows_tick 10000000  //10 7-Square # # Sec_to_unix_epoch 11644473600LL//1601 with 1970 time interval unsigned Windowsticktounixseconds (Long long windowsticks) {     return (unsigned) (windowsticks/windows_tick-sec_to_unix_ EPOCH);}

The code converted from Timeval to FILETIME is:

void Filetimetotimeval (FILETIME *pfiletime, struct timeval *ptimeval) {    calcoffsetfrom1601to1970 ();// 11644473600ll*10^7    Ulonglong ul64filetime = 0;     Ul64filetime |= pfiletime->dwhighdatetime;    Ul64filetime <<=;    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 *;    x + = g_ulloffsetfrom1601to1970;    Pfiletime->dwhighdatetime = (ULONG) (x >> +);    Pfiletime->dwlowdatetime = (ULONG) x;}

Conversion of Windows FILETIME to Unix time