code: void setDayOfMonth(String day) {
  
          final int i = CmsSerialDateUtil.toIntWithDefault(day, -1);
          if (m_model.getDayOfMonth() != i) {
              removeExceptionsOnChange(new Command() {
  
                  public void execute() {
  
                      m_model.setDayOfMonth(i);
                      onValueChange();
                  }
              });
          }
      }
docs: Sets the day of the month.
  @param day the day to set.