PHP Data and time comparision

function sqlArray($date, $trim=true) {
    $result = array();
    $result['day'] = ($trim==true) ? ltrim(substr($date,8,2),'0') : substr($date,8,2);
    $result['month'] = ($trim==true) ? ltrim(substr($date,5,2),'0') : substr($date,5,2);
    $result['year'] = substr($date,0,4);
    $result['hour'] = substr($date,11,2);
    $result['minutes'] = substr($date,14,2);
    return $result;
}

function sqlInt($date) {
    $date = sqlArray($date);
    return mktime($date['hour'], $date['minutes'], 0, $date['month'], $date['day'], $date['year']);
}
function difference($dateStart, $dateEnd) {
    $start = sqlInt($dateStart);
    $end = sqlInt($dateEnd);
    $difference = $end - $start;
    $result = array();
    $result['ms'] = $difference;
    $result['hours'] = $difference/3600;
    $result['minutes'] = $difference/60;
    $result['days'] = $difference/86400;
$result['months'] = $difference/86400/30;
    return $result;
}
print_r(difference('2011-01-17 11:01:44', date('Y-m-d')));