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<?php $datetime = new DateTime(); $datetime->modify('last day of December 2012'); var_dump($datetime->format('Y-m-d')); $anotherdt = new DateTime('last day of December 2012'); var_dump($anotherdt->format('Y-m-d'));
Output for 5.3.6 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.26, 8.0.0 - 8.0.13, 8.1rc1 - rc3
string(10) "2012-12-31" string(10) "2012-12-31"
Output for 5.3.0 - 5.3.5
string(10) "2015-04-30" string(10) "2012-12-31"
Output for 5.2.13 - 5.2.17
Warning: DateTime::modify(): Failed to parse time string (last day of December 2012) at position 9 (o): The timezone could not be found in the database in /in/6PJ9o on line 5 string(10) "2015-04-20" Fatal error: Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (last day of December 2012) at position 9 (o): The timezone could not be found in the database' in /in/6PJ9o:8 Stack trace: #0 /in/6PJ9o(8): DateTime->__construct('last day of Dec...') #1 {main} thrown in /in/6PJ9o on line 8
Process exited with code 255.
Output for 5.2.0 - 5.2.12
string(10) "2015-04-19" Fatal error: Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (last day of December 2012) at position 9 (o): The timezone could not be found in the database' in /in/6PJ9o:8 Stack trace: #0 /in/6PJ9o(8): DateTime->__construct('last day of Dec...') #1 {main} thrown in /in/6PJ9o on line 8
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/6PJ9o on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/6PJ9o 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/6PJ9o on line 4

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