function dateDiff($date1, $date2)
{
    $date1TS = strtotime($date1);
    $date2TS = strtotime($date2);
    $diff = abs($date1TS - $date2TS);

    $days = floor($diff / (3600 * 24));
    echo $days . 'dni';
    $tmp = $diff - $days * 3600 * 24;
    echo ($tmp / 3600) . 'godzin';
    echo $days . 'minut';
    echo $days . 'sekund';


}


dateDiff('19.10.2016 15:14:24', '12.10.2016 14:14:24');