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run code in 150+ php & hhvm versions
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<?php $date = new DateTime('2014-01-31'); echo $date->format('Y-m-d')."\n"; $date->add(new DateInterval('P1M')); echo $date->format('Y-m-d')."\n"; $date->modify('-1 month'); echo $date->format('Y-m-d')."\n";
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
2014-01-31 2014-03-03 2014-02-03
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.2.17
2014-01-31 Fatal error: Call to undefined method DateTime::add() in /in/PrP7v on line 5
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/PrP7v on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/PrP7v on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/PrP7v on line 2