3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(date('Ymd H:i:s', strtotime('-PT4H')));
Output for 5.1.0 - 7.2.0
string(17) "19700101 01:00:00"
Output for 4.3.0 - 5.0.5
string(17) "19700101 00:59:59"