public function start()
    {
        $this->oxactions__oxactivefrom = new \OxidEsales\Eshop\Core\Field(date('Y-m-d H:i:s', \OxidEsales\Eshop\Core\Registry::getUtilsDate()->getTime()));
        if ($this->oxactions__oxactiveto->value && ($this->oxactions__oxactiveto->value != '0000-00-00 00:00:00')) {
            $iNow = \OxidEsales\Eshop\Core\Registry::getUtilsDate()->getTime();
            $iTo = strtotime($this->oxactions__oxactiveto->value);
            if ($iNow > $iTo) {
                $this->oxactions__oxactiveto = new \OxidEsales\Eshop\Core\Field('0000-00-00 00:00:00');
            }
        }
        $this->save();
    }