Online PHP editor | output for 6hbDZ

<?php $default = "2001-01-01 12:34:56"; $date='2018-06-29 00:00:00'; $startDate=(new DateTime($default))->setISODate(date('Y',strtotime($date)),date('W',strtotime($date)))->format('Y-m-d H:i:s'); $endDate=(new DateTime($default))->setISODate(date('Y',strtotime($date)), date('W',strtotime($date)), 7)->format('Y-m-d H:i:s'); $startTimestamp = (new DateTime($default))->setISODate(date('Y',strtotime($date)),date('W',strtotime($date)))->getTimestamp(); echo 'input = '.$date; echo "\nstrtotime = ".strtotime($date); echo "\nsetISODate->getTimestamp = "; echo $startTimestamp; echo "\nstartDate = ".$startDate."\nendDate = ".$endDate;