vypisat v latte atribut typu time

Chcem sa opytat ako vypisat z databazy atribut typu „time“ v latte sablone?

V sablone to vypisujem takto:

<?php
	{foreach $course_harmonogram as $ch}
        <tr>
            <td> {$course->start}</td>
            <td> {$course->end}</td>
            <td> {$ch->event} </td>
        </tr>
    {/foreach}
?>

premenne $course->start a $course->end su data z databazy typu time. Ak to spustim vypise mi chybu:
Object of class DateInterval could not be converted to string.