3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $dt = new DateTime('first Monday of August'); echo $dt->format('W');
based on ZYQkO
Output for 5.3.18 - 5.4.45, 5.6.28, 7.0.20 - 7.2.0
32
Output for 5.5.24 - 5.6.21, 7.0.0 - 7.0.6
31