- date_default_timezone_set: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
date_default_timezone_set('Europe/Sofia');
$mondayLastWeek = new DateTime("next monday");
$mondayLastWeek->sub(new DateInterval('P14D'));
echo date('d.m.Y H:i:s', strtotime('1 Monday ago')) ;