3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $lastmonth = date('Y-m-01',mktime(0, 0, 0, date("m")-3, date("d"), date("Y"))); echo $lastmonth ; ?>
based on J0GFi
Output for 4.3.0 - 7.1.10
2014-05-01