How To Convert a UNIX time_t to a Win32 FILETIME or SYSTEMTIME
Q
How to convert a Unix timestamp to a Win32 FILETIME or SYSTEMTIME?
✍: FYIcenter
A
The following function converts a filetime in the UNIX time_t format to a Win32 FILETIME format. Note that time_t is a 32-bit value and FILETIME is a 64-bit structure, so the Win32 function, Int32x32To64() is used in the following function:
#include#include #include void UnixTimeToFileTime(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; }
Once the UNIX time is converted to a FILETIME structure, other Win32 time formats can be easily obtained by using Win32 functions such as FileTimeToSystemTime() and FileTimeToDosDateTime().
void UnixTimeToSystemTime(time_t t, LPSYSTEMTIME pst)
{
FILETIME ft;
UnixTimeToFileTime(t, &ft);
FileTimeToSystemTime(&ft, pst);
}
2012-01-02, 6588👍, 0💬