Php count second different

<?php

$hour1 = '12:00:00';
$hour2 = '09:00:00';

$o1 = new DateTime($hour1);
$o2 = new DateTime($hour2);

$diff = $o1->diff($o2,true); // to make the difference to be always positive.

echo $diff->format('%H:%I:%S');

Source: stackoverflow.com

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