private function getAgeWhoIs($domain)
    {
        $data = $this->getUrl('https://www.who.is/whois/' . urlencode($domain));
        preg_match('#(?:Creation Date|Created On|created|Registered on)\.*:\s*([ \ta-z0-9\/\-:\.]+)#si', $data, $p);
        if (!empty($p[1])) {
            $value = strtotime(trim($p[1]));
            if ($value === false) {
                return 0;
            }
            return $value;
        }
        return 0;
    }