symfony/src/Symfony/Component/Validator/Constraints/DateTimeValidator.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Validator\Constraints;

class DateTimeValidator extends DateValidator
{
    const PATTERN = '/^(\d{4})-(\d{2})-(\d{2}) (0[0-9]|1[0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9])$/';
}