- strtotime: documentation ( source)
<?php
$dates = array("2013-12-24","2013-12-25","2014-12-24","2013-12-27");
$start = strtotime('2013-12-25');
$end = strtotime('2013-12-26');
foreach($dates AS $date) {
$timestamp = strtotime($date);
if($timestamp >= $start && $timestamp <= $end) {
echo "The date $date is within our date range\n";
} else {
echo "The date $date is NOT within our date range\n";
}
}