SystemTimeToFileTime

BOOL SystemTimeToFileTime(SYSTEMTIME* st, LONGLONG* ft)
{
    if (st == NULL || ft == NULL)
    {
        return FALSE;
    }

    FILETIME ftm;
    if (!::SystemTimeToFileTime(st, &ftm))
    {
        return FALSE;
    }

    *ft = ftm.dwHighDateTime;
    *ft = (*ft) << 32 | ftm.dwLowDateTime;

    return TRUE;
}