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<?php $dt = new DateTime('0000-00-00 00:00:00', new \DateTimeZone('UTC')); $serial = serialize($dt); var_dump( $serial );
Output for git.master, git.master_jit, rfc.property-hooks
string(115) "O:8:"DateTime":3:{s:4:"date";s:27:"-0001-11-30 00:00:00.000000";s:13:"timezone_type";i:3;s:8:"timezone";s:3:"UTC";}"

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