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<?php $date = strtotime('first day of previous month 00:00:00', new DateTimeZone('UTC')); var_dump($date->format('Y-m-d H:i:s')); // string(19) "2013-11-01 00:00:00" $date = new DateTime('first day of previous month 00:00:00', new DateTimeZone('Europe/Amsterdam')); var_dump($date->format('Y-m-d H:i:s')); // string(19) "2013-11-01 00:00:00" $date = new DateTime('midnight first day of previous month', new DateTimeZone('Europe/Amsterdam')); var_dump($date->format('Y-m-d H:i:s')); // string(19) "2013-11-01 00:00:00" $date = new DateTime('midnight first day of previous month', new DateTimeZone('UTC')); var_dump($date->format('Y-m-d H:i:s')); // string(19) "2013-11-01 00:00:00"
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught TypeError: strtotime(): Argument #2 ($baseTimestamp) must be of type ?int, DateTimeZone given in /in/D3fk0:2 Stack trace: #0 /in/D3fk0(2): strtotime('first day of pr...', Object(DateTimeZone)) #1 {main} thrown in /in/D3fk0 on line 2
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: strtotime() expects parameter 2 to be int, object given in /in/D3fk0 on line 2 Fatal error: Uncaught Error: Call to a member function format() on bool in /in/D3fk0:3 Stack trace: #0 {main} thrown in /in/D3fk0 on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Warning: strtotime() expects parameter 2 to be integer, object given in /in/D3fk0 on line 2 Fatal error: Uncaught Error: Call to a member function format() on boolean in /in/D3fk0:3 Stack trace: #0 {main} thrown in /in/D3fk0 on line 3
Process exited with code 255.
Output for 5.6.8 - 5.6.28
Warning: strtotime() expects parameter 2 to be long, object given in /in/D3fk0 on line 2 Fatal error: Call to a member function format() on boolean in /in/D3fk0 on line 3
Process exited with code 255.
Output for 5.4.1 - 5.4.45, 5.5.24 - 5.5.35
Warning: strtotime() expects parameter 2 to be long, object given in /in/D3fk0 on line 2 Fatal error: Call to a member function format() on a non-object in /in/D3fk0 on line 3
Process exited with code 255.

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