wtf php?!

$d1 = new DateTime();
$d2 = new DateTime('21:00:00');
$d3 = new DateTime('09:00:00');
$d4=$d2->diff($d1);
$d5=$d3->diff($d1);
echo $d4->format(' %h:%i:%s is 21:00?');
echo $d5->format(' %h:%i:%s is 9:00?');
?>