3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = strtotime('first day of January'); echo $a;
based on 0N1fZ
Output for 5.3.20 - 5.4.45, 5.6.28, 7.0.20 - 7.2.0
1420066800
Output for 5.5.24 - 5.6.21, 7.0.0 - 7.0.6
1451602800