static extern bool DosDateTimeToFileTime(ushort wFatDate, ushort wFatTime,

    private static extern int DosDateTimeToFileTime(ushort dateValue, ushort timeValue, out UInt64 fileTime);

        result = DosDateTimeToFileTime(dateValue, timeValue, out data);

        DosDateTimeToFileTime(DosDate, DosTime, out filetime);

static extern bool CoDosDateTimeToFileTime(