public function shiftServerTime($iTime)
    {
        $iServerTimeShift = \OxidEsales\Eshop\Core\Registry::getConfig()->getConfigParam('iServerTimeShift');
        if ($iServerTimeShift) {
            $iTime = $iTime + ((int) $iServerTimeShift * 3600);
        }
        return $iTime;
    }