- date_diff: documentation ( source)
<?php
$date = new \DateTime('2015-05-24 00:00:00');
$time = new \DateTime('0000-00-00 21:22:00');
$pickUpDateTime = new \DateTime();
$pickUpDateTime->setDate($date->format('Y'), $date->format('m'), $date->format('d'));
$pickUpDateTime->setTime($time->format('H'), $time->format('i'), $time->format('s'));
$now = new DateTime("now");
$interval = date_diff($now, $pickUpDateTime);
if ( $v = $interval->h >= 1 )
echo ($interval->d);