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<?php $date = new DateTime('2014-10-30'); $date->add(new DateInterval('P2Y9M')); echo $date->format('Y-m-d H:i:s') . "\n";
based on kEUGT
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
2017-07-30 00:00:00
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.2.17
Fatal error: Call to undefined method DateTime::add() in /in/a74Tp on line 4
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/a74Tp on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/a74Tp on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/a74Tp on line 3