FILETIME 与time_t

FILETIME 与 Time_t

Unix 起始时间 1970-01-01 00:00:00 计数单位为 秒
Win32 FileTime 起始时间 1601-01-01 00:00:00 计数单位为 100纳秒
1 s = 1000 ms = 1000000 μs = 1000000000 ns

两者相差毫秒数为：11644473600000L

FILETIME To Time_t

void  FileTimeToTime_t(  FILETIME  ft,  time_t  *t  )  
{   
	ULARGE_INTEGER ui;  
	
	ui.LowPart =  ft.dwLowDateTime;  
	ui.HighPart =  ft.dwHighDateTime;  
	*t  =  ((LONGLONG)(ui.QuadPart  -  116444736000000000)  /  10000000); 
}  

Time_t To FILETIME

void Time_tToFileTime(time_t t, LPFILETIME pft)
{
	// Note that LONGLONG is a 64-bit value
	LONGLONG ll;

	ll = Int32x32To64(t, 10000000) + 116444736000000000;
	pft->dwLowDateTime = (DWORD)ll;
	pft->dwHighDateTime = ll >> 32;
}