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<?php echo (new DateTime('10-01-01'))->format('Y-m-d'), "\n"; echo (new DateTime('010-01-01'))->format('Y-m-d'), "\n"; echo (new DateTime('0010-01-01'))->format('Y-m-d'), "\n"; echo (new DateTime('00010-01-01'))->format('Y-m-d'), "\n"; echo (new DateTime('000010-01-01'))->format('Y-m-d'), "\n"; echo (new DateTime('0000010-01-01'))->format('Y-m-d'), "\n"; echo (new DateTime('00000010-01-01'))->format('Y-m-d'), "\n"; echo (new DateTime('000000010-01-01'))->format('Y-m-d');
Output for 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
2010-01-01 2010-01-01 0010-01-01 2000-01-01 2018-02-22 0000-01-10 -0001-12-10 Fatal error: Uncaught DateMalformedStringException: Failed to parse time string (000000010-01-01) at position 8 (0): Double date specification in /in/VJQiK:10 Stack trace: #0 /in/VJQiK(10): DateTime->__construct('000000010-01-01') #1 {main} thrown in /in/VJQiK on line 10
Process exited with code 255.
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30
2010-01-01 2010-01-01 0010-01-01 2000-01-01 2018-02-22 0000-01-10 -0001-12-10 Fatal error: Uncaught Exception: Failed to parse time string (000000010-01-01) at position 8 (0): Double date specification in /in/VJQiK:10 Stack trace: #0 /in/VJQiK(10): DateTime->__construct('000000010-01-01') #1 {main} thrown in /in/VJQiK on line 10
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
2010-01-01 2010-01-01 0010-01-01 2000-01-01 2018-02-22 0000-01-10 -0001-12-10 Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (000000010-01-01) at position 8 (0): Double date specification in /in/VJQiK:10 Stack trace: #0 /in/VJQiK(10): DateTime->__construct('000000010-01-01') #1 {main} thrown in /in/VJQiK on line 10
Process exited with code 255.

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