- var_dump: documentation ( source)
<?php
$today_date = DateTime::createFromFormat('Y-m-d H:i:s', '2017-03-03 07:00:00');
$overdue_date = DateTime::createFromFormat('Y-m-d H:i:s', '2017-03-02 23:59:59');
var_dump(($today_date->format("Y-m-d H:i:s") <= $overdue_date->format("Y-m-d H:i:s")));
var_dump($today_date->diff($overdue_date)->days);
if ($today_date->diff($overdue_date)->days == 1) {
echo "Notify!";
} else {
echo "Ndak di notify!";
}