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<?php $datetime = \DateTime::createFromFormat('Y-m-d', '2017-13-55'); print $datetime->format('Y-m-d') . "\n\n"; var_dump(\DateTime::getLastErrors());
Output for git.master, git.master_jit, rfc.property-hooks
2018-02-24 array(4) { ["warning_count"]=> int(1) ["warnings"]=> array(1) { [10]=> string(27) "The parsed date was invalid" } ["error_count"]=> int(0) ["errors"]=> array(0) { } }

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