- date_default_timezone_set: documentation ( source)
<?php
date_default_timezone_set('Europe/Sofia');
// echo date('d.m.Y H:i:s') . ' ' ;
//echo strtotime('next Monday - 1 week') . ' ';
$date = new DateTime("next monday");
echo $date->format('d.m.Y H:i:s');
//echo date('d.m.Y H:i:s', strtotime("next monday - 1 week")) ;
//echo ' ';
//echo strtotime('1 Monday ago', strtotime('08.12.2013'));