- date: documentation ( source)
- strtotime: documentation ( source)
<?php
$last_week = strtotime('Last Saturday 11:00:01 PM');
$last_week = date("Y-m-d H:i:s", $last_week);
$today = strtotime('Today 11 PM');
$today = date("Y-m-d H:i:s", $today);
echo $last_week;
echo $today;