<?php
//round pour le changement d'heure
$debut = mktime(12, 0, 0, 02, 15, 2014);
$fin = mktime(12, 0, 0, 02, 16, 2014);
$d1 = new DateTime('now',new DateTimeZone('America/Sao_Paulo'));
$d2 = new DateTime('now',new DateTimeZone('America/Sao_Paulo'));
$d1->setTimestamp($debut);
$d2->setTimestamp($fin);
$diff = $d1->diff($d2);
print_r($diff);
preferences:
58.97 ms | 402 KiB | 5 Q