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@ 2013-10-23T20:19:18Z

<?php
$date1 = new DateTime('2013-10-23 09:00:00');
$date2 = new DateTime('2013-10-24 02:00:00');

$interval = $date1->diff($date2);
echo ceil((int)$interval->format('%h')/24);

Output
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ceil: documentation ( source)

preferences:dark modelive preview

39.91 ms | 402 KiB | 5 Q