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<?php $years = 5; $baseDate = new \DateTime(); $baseDate = new \DateTime($baseDate->format('Y-m-01 00:00:00')); $baseDate->modify('-' . $years . ' years'); var_dump($baseDate);
Output for git.master, git.master_jit, rfc.property-hooks
object(DateTime)#2 (3) { ["date"]=> string(26) "2011-09-01 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

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