GuzzleHttp\Tests\MessageFormatterTest::dateProvider PHP Method

    public function dateProvider()
    {
        return [['{ts}', '/^[0-9]{4}\\-[0-9]{2}\\-[0-9]{2}/'], ['{date_iso_8601}', '/^[0-9]{4}\\-[0-9]{2}\\-[0-9]{2}/'], ['{date_common_log}', '/^\\d\\d\\/[A-Z][a-z]{2}\\/[0-9]{4}/']];
    }