- explode: documentation ( source)
<?php
$now = new DateTime();
echo $now->format('d-m-Y H:i').' | ';
$time = '02:03';
$time = explode(':', $time);
$interval = new DateInterval('PT'.$time[0].'H'.$time[1].'M');
$now->add($interval);
echo $now->format('d-m-Y H:i');