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<?php class Foo extends DateTime { const ATOM = 'Y-m-d'; } echo (new DateTime())->format(DateTime::ATOM), PHP_EOL; echo (new Foo())->format(Foo::ATOM);
Output for git.master, git.master_jit, rfc.property-hooks
2016-02-07T11:17:25+01:00 2016-02-07

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