code: public void setShowMonthItem(boolean enable) {
          if(enable && !showMonthItem) {
              // create the in 1 month item
              final Calendar date = Calendar.getInstance();
              date.add(Calendar.MONTH, 1);
              addAdapterItem(new DateItem(formatDate(date), date, R.id.date_month));
          }
          else if(!enable && showMonthItem) {
              removeAdapterItemById(R.id.date_month);
          }
          showMonthItem = enable;
      }
docs: Toggles showing the month item. Month mode an item in exactly one month from now.
  @param enable True to enable, false to disable month mode.