3v4l.org

run code in 300+ PHP versions simultaneously
<?php $date = new \DateTime('first day of last month'); echo $date->format('Y-m-d');
Output for 5.6.28, 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
2015-09-01
Output for 5.5.24, 5.5.35, 5.6.21, 7.0.6
2016-04-01
Output for 5.5.25 - 5.5.30, 5.5.34, 5.6.8 - 5.6.14, 5.6.20, 7.0.5
2016-03-01
Output for 5.5.31 - 5.5.33, 5.6.15 - 5.6.19, 7.0.0 - 7.0.4
2016-02-01
Output for 5.4.8 - 5.4.45
2015-10-01
preferences:
166.14 ms | 401 KiB | 265 Q