Online PHP editor | refs for PONuS

<?php $startOfWeek = '16-07-2017'; $endOfWeek = new DateTime($startOfWeek); var_dump($endOfWeek); $endOfWeekString = $endOfWeek->modify('+5 day')->format('d-m-Y'); function firstDayOfWeek($date) { $day = DateTime::createFromFormat('d-m-Y', $date); $day->setISODate((int)$day->format('o'), (int)$day->format('W'), 1); return $day->format('d-m-Y'); } var_dump(firstDayOfWeek($startOfWeek)); echo $endOfWeekString;