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<?php if (class_exists('DateTimeImmutable')) { echo serialize(new DateTimeImmutable('2015-01-01 00:00:00.123456')); }
Output for git.master, git.master_jit, rfc.property-hooks
O:17:"DateTimeImmutable":3:{s:4:"date";s:26:"2015-01-01 00:00:00.123456";s:13:"timezone_type";i:3;s:8:"timezone";s:16:"Europe/Amsterdam";}

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