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<?php $dateString = '2018-31-12T01:01:01+00:00'; $check = date_parse_from_format(DATE_ATOM, $dateString); // var_dump($check); if ( checkdate($check['month'], $check['day'], $check['year']) ) { $converted = DateTime::createFromFormat(DATE_ATOM, $dateString); var_dump($converted); } else { echo "No valid date given"; }