3v4l.org

run code in 300+ PHP versions simultaneously
<?php $v = new DateTime(); $v->setDate('2019','12','21'); echo $v->format('W');
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
51
preferences:
204.81 ms | 403 KiB | 182 Q