来自nginx代码：
void ngx_gettimeofday(struct timeval *tp) { uint64_t intervals; FILETIME ft; GetSystemTimeAsFileTime(&ft); /* * A file time is a 64-bit value that represents the number * of 100-nanosecond intervals that have elapsed since * January 1, 1601 12:00 A.M. UTC. * * Between January 1, 1970 (Epoch) and January 1, 1601 there were * 134744 days, * 11644473600 seconds or * 11644473600,000,000,0 100-nanosecond intervals. * * See also MSKB Q167296. */ intervals = ((uint64_t) ft.dwHighDateTime << 32) | ft.dwLowDateTime; intervals -= 116444736000000000; tp->tv_sec = (long) (intervals / 10000000); tp->tv_usec = (long) ((intervals % 10000000) / 10); }
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