Devise\Pages\PageVersionManager::convertToDatabaseTimestamp PHP Метод

    protected function convertToDatabaseTimestamp($timestamp, $from = 'm/d/y H:i:s', $to = 'Y-m-d H:i:s')
    {
        if (!$timestamp) {
            return null;
        }
        $date = DateTime::createFromFormat($from, $timestamp);
        return $date->format($to);
    }