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<?php echo date('Y-m-d', strtotime('2017-01-01')); echo "\n"; $mydate = date('Y-m-d', strtotime('2017-01-01')); echo date('m/d/Y', strtotime('01/01/2017')); echo "\n"; echo preg_match('/^\d{4}-\d{2}-\d{2}$/', $mydate);

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