3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $xmas = new DateTime('first day of last month'); echo $xmas->format('Ymd');
based on DM2LW
Output for 5.3.19 - 5.4.45, 5.6.28, 7.0.20 - 7.2.0
20151001
Output for 5.5.24, 5.5.35, 5.6.21, 7.0.6
20160401
Output for 5.5.25 - 5.5.30, 5.5.34, 5.6.8 - 5.6.14, 5.6.20, 7.0.5
20160301
Output for 5.5.31 - 5.5.33, 5.6.15 - 5.6.19, 7.0.0 - 7.0.4
20160201