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run code in 150+ php & hhvm versions
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<?php $d1 = '2014-10-25 00:00:01'; $d2 = '2014-10-26 00:00:00'; $dt1 = new DateTime($d1); $dt2 = new DateTime($d2); var_dump ($dt1->add(new DateInterval('P1M')));
based on DENP5
Output for 5.4.30 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2014-11-25 00:00:01.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.4.29
object(DateTime)#1 (3) { ["date"]=> string(19) "2014-11-25 00:00:01" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.2.0 - 5.2.17
Fatal error: Call to undefined method DateTime::add() in /in/6X4Fv on line 7
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/6X4Fv on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/6X4Fv on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/6X4Fv on line 4