3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $derp = mktime(0, 0, 0, date('n'), date('j') - date('j') + 1); echo "\n".date('c', $derp);
based on Ph1Q8
Output for 5.0.0 - 7.1.0
2014-08-01T00:00:00+02:00
Output for 4.3.0 - 4.4.9
c