PHP example of DateInterval difference

demo.php

<?php

function getDiff($start, $end)
{
    $start = explode(':', $start);
    $end = explode(':', $end);

    $start = new DateInterval('PT'.$start[0].'H'.$start[1].'M'.$start[2].'S');
    $end = new DateInterval('PT'.$end[0].'H'.$end[1].'M'.$end[2].'S');

    $startTime = new DateTime();
    $startTime->add($start);
    
    $endTime = new DateTime();
    $endTime->add($end);
    
    $diff = $endTime->diff($startTime);

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

var_dump(getDiff('178:10:28', '182:00:00'));