Coupon::afterFind PHP Method

    public function afterFind()
    {
        $this->start_time = !$this->start_time ? '' : date('Y-m-d', strtotime($this->start_time));
        $this->end_time = !$this->end_time ? '' : date('Y-m-d', strtotime($this->end_time));
        parent::afterFind();
    }