Getting the closest midnight relative to a certain DateTime.

gistfile1.php

<?php
	function closestMidnight($date) {
		if (!is_a($date, 'DateTime')) {
			try { $date = new DateTime($date); }
			catch (Exception $e) {
				if (is_numeric($date)) { $date = (new DateTime())->setTimestamp(intval($date)); }
				else { return false; }
			}
		}
		$comp = clone $date;
		return $date->modify(($date>$comp->modify('noon')?'+1 day ':'').'midnight');
	}
?>