- date_default_timezone_set: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
date_default_timezone_set('Europe/Sofia');
echo date('d m Y h:i:s', strtotime('1 Monday ago', strtotime('08.12.2013'))) ;
echo ' ';
echo strtotime('1 Monday ago', strtotime('08.12.2013'));