我想显示过期的产品从数据库的日期最多有14天到期，下面的代码只显示1天到期的产品，请我想显示14天到期的产品以及

public function out_of_date(){
     //$date=date('Y-n-j');
    $date=date('Y-m-d');
    $this->db->select('a.expeire_date as exp_date,a.*,b.*,c.*');
    $this->db->from('product_purchase_details a');
    $this->db->join('product_information c','c.product_id=a.product_id');
    $this->db->join('view_m_total_batch_stock b','b.batch_id=a.batch_id');
    $this->db->where('b.stock >',0);
    $this->db->where('a.expeire_date <=', $date);
    $this->db->group_by('b.batch_id');
    $query = $this->db->get();
    if ($query->num_rows() > 0) {
        return $query->result_array();  
    }
    return false;
}