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<?php var_dump(new \DateTime('-1 month 4:20am'));
Output for 5.4.30 - 5.4.34, 5.6.28, 7.0.14 - 7.1.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2014-10-01 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.6
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-03 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.14, 7.0.5
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-02 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.4
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-10 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.3
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-18 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.2
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-22 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.1
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-23 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.0.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-26 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for hhvm-3.12.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-29 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.6.21
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-02 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.20
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-09 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.19
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-07 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.18
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-14 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.17
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-19 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.16
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-27 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.15
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-28 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.13
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-15 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.12
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-19 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.11
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-23 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.10
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-25 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.9
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-27 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.8
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-29 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.6.7
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-25 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.35
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-22 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.34
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-10 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.33
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-08 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.32
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-17 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.31
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-02-20 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.30
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-01 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.29
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-16 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.28
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-20 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.27
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-22 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.26
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-26 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.25
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-03-28 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.5.24
object(DateTime)#1 (3) { ["date"]=> string(26) "2016-04-23 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.35 - 5.4.45
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-08-07 04:20:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.0 - 5.4.29
object(DateTime)#1 (3) { ["date"]=> string(19) "2014-10-01 04:20:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.2.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/gWrWE on line 2 object(DateTime)#1 (0) { }
Output for 5.0.0 - 5.1.6
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/gWrWE on line 2 Fatal error: Class 'DateTime' not found in /in/gWrWE on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/gWrWE on line 2 Fatal error: Cannot instantiate non-existent class: datetime in /in/gWrWE on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/gWrWE on line 2 Fatal error: Cannot instantiate non-existent class: datetime in /in/gWrWE on line 2