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<?php $dt = new \DateTime(); $olderDt = (clone $dt)->sub(new \DateInterval('PT1D')); print_r($dt); print_r($olderDt);
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught DateMalformedIntervalStringException: Unknown or bad format (PT1D) in /in/HN49J:4 Stack trace: #0 /in/HN49J(4): DateInterval->__construct('PT1D') #1 {main} thrown in /in/HN49J on line 4
Process exited with code 255.
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Fatal error: Uncaught Exception: Unknown or bad format (PT1D) in /in/HN49J:4 Stack trace: #0 /in/HN49J(4): DateInterval->__construct('PT1D') #1 {main} thrown in /in/HN49J on line 4
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, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Fatal error: Uncaught Exception: DateInterval::__construct(): Unknown or bad format (PT1D) in /in/HN49J:4 Stack trace: #0 /in/HN49J(4): DateInterval->__construct('PT1D') #1 {main} thrown in /in/HN49J on line 4
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '->' (T_OBJECT_OPERATOR) in /in/HN49J on line 4
Process exited with code 255.

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