// This method used to load service bill details between the date range
 public void load_sbd_bw_date_range() {
   List<Object[]> bill_details =
       dbh.get_bill_details_between_date_range(
           jdp_from.getDate().toString(), jdp_to.getDate().toString());
   load_service_bill_details(bill_details);
   calculate_total();
 }