Stash\Item::expiresAfter PHP Method

    public function expiresAfter($time)
    {
        $date = new \DateTime();
        if (is_numeric($time)) {
            $dateInterval = \DateInterval::createFromDateString(abs($time) . ' seconds');
            if ($time > 0) {
                $date->add($dateInterval);
            } else {
                $date->sub($dateInterval);
            }
            $this->expiration = $date;
        } elseif ($time instanceof \DateInterval) {
            $date->add($time);
            $this->expiration = $date;
        } else {
        }
        return $this;
    }