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<?php $dateOld = new \DateTimeImmutable('2020-01-01'); echo $dateOld->modify("last day of last month")->format('Y-m-d'); echo PHP_EOL; echo $dateOld->modify("first day of next month")->format('Y-m-d');
Output for git.master_jit, git.master, rfc.property-hooks
2019-12-31 2020-02-01

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