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<?php var_dump((new \DateTime('today - 3 month'))->modify('first day of month'));
Output for git.master, git.master_jit
Warning: DateTime::modify(): Failed to parse time string (first day of month) at position 13 (m): The timezone could not be found in the database in /in/gp0vc on line 3 bool(false)
Output for rfc.property-hooks
Fatal error: Uncaught DateMalformedStringException: DateTime::modify(): Failed to parse time string (first day of month) at position 13 (m): The timezone could not be found in the database in /in/gp0vc:3 Stack trace: #0 /in/gp0vc(3): DateTime->modify('first day of mo...') #1 {main} thrown in /in/gp0vc on line 3
Process exited with code 255.

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