- date_diff: documentation ( source)
- date_create: documentation ( source)
<?php
$date1 = date_create("12:45:00");
$date2 = date_create("11:00:00");
$diff=date_diff($date1,$date2);
echo "Difference in Hours\n";
echo $diff->format("%R%H hours")."\n";
echo "Difference in Minutes\n";
echo $diff->format("%R%i minutes");