public function setStartDay($daysBack)
    {
        if (!is_null($daysBack)) {
            $this->addStatusMessage('Start Date '.date('Y-m-d',
                    mktime(0, 0, 0, date("m"), date("d") - $daysBack, date("Y"))));
        }
        $this->daysBack = $daysBack;
    }