3v4l.org

run code in 300+ PHP versions simultaneously
<?php $dte = new DateTime(date('Y-m-d H:i:s')); var_dump($dte->format('Y-W')); $dte->modify('+4 weeks'); var_dump($dte->format('Y-m-d H:i:s -- Y_W')); $dte->modify('+1 days'); var_dump($dte->format('Y-m-d H:i:s -- Y_W'));

preferences:
37.29 ms | 402 KiB | 5 Q