3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo strtotime('-1 month', '2013-10-31');
Output for 5.1.0 - 7.1.0
Notice: A non well formed numeric value encountered in /in/887ZR on line 2 -2676387
Output for 4.3.0 - 4.4.9, 5.0.3 - 5.0.5
-2676387
Output for 5.0.0 - 5.0.2
-2682000