The FileTimeToSystemTime function converts a 64-bit file time to system time format.

BOOL FileTimeToSystemTime(
  CONST FILETIME *lpFileTime,  // pointer to file time to convert
  LPSYSTEMTIME lpSystemTime    // pointer to structure to receive 
                               // system time


Pointer to a FILETIME structure containing the file time to convert to system date and time format.

The FileTimeToSystemTime function only works with FILETIME values that are less than 0x8000000000000000. The function fails with values equal to or greater than that.

Pointer to a SYSTEMTIME structure to receive the converted file time.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.


As noted above, the function fails for FILETIME values that are equal to or greater than 0x8000000000000000.


  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Requires version 1.0 or later.
  Header: Declared in winbase.h.
  Import Library: Use kernel32.lib.

See Also

Time Overview, Time Functions, DosDateTimeToFileTime, FILETIME, FileTimeToDosDateTime, SYSTEMTIME, SystemTimeToFileTime