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<?php echo \DateTime::createFromFormat('e', 'CET')->modify('30m')->format('Hi');
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught DateMalformedStringException: DateTime::modify(): Failed to parse time string (30m) at position 0 (3): Unexpected character in /in/opAXc:3 Stack trace: #0 /in/opAXc(3): DateTime->modify('30m') #1 {main} thrown in /in/opAXc on line 3
Process exited with code 255.
Output for 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Warning: DateTime::modify(): Failed to parse time string (30m) at position 0 (3): Unexpected character in /in/opAXc on line 3 Fatal error: Uncaught Error: Call to a member function format() on bool in /in/opAXc:3 Stack trace: #0 {main} thrown in /in/opAXc on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33
Warning: DateTime::modify(): Failed to parse time string (30m) at position 0 (3): Unexpected character in /in/opAXc on line 3 Fatal error: Uncaught Error: Call to a member function format() on boolean in /in/opAXc:3 Stack trace: #0 {main} thrown in /in/opAXc on line 3
Process exited with code 255.
Output for 5.6.8 - 5.6.28
Warning: DateTime::modify(): Failed to parse time string (30m) at position 0 (3): Unexpected character in /in/opAXc on line 3 Fatal error: Call to a member function format() on boolean in /in/opAXc on line 3
Process exited with code 255.
Output for 5.5.24 - 5.5.35
Warning: DateTime::modify(): Failed to parse time string (30m) at position 0 (3): Unexpected character in /in/opAXc on line 3 Fatal error: Call to a member function format() on a non-object in /in/opAXc on line 3
Process exited with code 255.

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