public List<ScheduleCalendar> listSchedule(String groupID, String yyyy_mm) {
    List<ScheduleCalendar> resultList = null;
    try {
      resultList = scheduleDAO.listSchedule(groupID, yyyy_mm);

    } catch (Exception e) {
      logger.error(e);
    }
    return resultList;
  }
  public ScheduleCalendar viewSchedule(int massmailID, int scheduleID) {
    ScheduleCalendar sc = null;

    try {

      sc = scheduleDAO.viewSchedule(massmailID, scheduleID);

    } catch (Exception e) {
      logger.error(e);
    }
    return sc;
  }