- date: documentation ( source)
- strtotime: documentation ( source)
<?php
$time1 = strtotime('09:00:59');
$time2 = strtotime('09:01:00');
$diff = $time2 - $time1;
echo 'Time 1: '.date('H:i:s', $time1).'<br>';
echo 'Time 2: '.date('H:i:s', $time2).'<br>';
if($diff){
echo 'Diff: '.date('H:i:s', $diff);
}else{
echo 'No Diff.';
}
?>