Online PHP editor | refs for WJbBm

<?php $lastmonday = strtotime('last monday of this month'); echo date('Y-m-d',$lastmonday); $firstday = strtotime('first day of this month'); echo date('Y-m-d',$firstday); $d1 = new DateTime($lastmonday); $dd1 = $d1->format('Y-m-d'); $d2 = new DateTime($firstday); $dd2 = $d2->format('Y-m-d'); $period_serv = $dd1->diff($dd2); $theperiod = $period_serv->format('%a'); echo $theperiod;