- mktime: documentation ( source)
<?php
//round pour le changement d'heure
$debut = mktime(0, 0, 0, 10, 26, 2013);
$fin = mktime(0, 0, 0, 11, 10, 2013);
$d1 = self::getDateObject();
$d2 = self::getDateObject();
$d1->setTimestamp($debut);
$d2->setTimestamp($fin);
$diff = $d1->diff($d2);
prin_t($diff);