code: public void setTimeStart(long timeStart) {
  
          checkFrozen();
          if (timeStart < 0) {
              throw new CmsIllegalArgumentException(
                  Messages.get().container(Messages.ERR_LOGIN_MESSAGE_BAD_TIME_1, new Long(timeStart)));
          }
          if (timeStart == 0) {
              timeStart = DEFAULT_TIME_START;
          }
          m_timeStart = timeStart;
      }
docs: Sets the time when to start displaying this message.<p>
  
  @param timeStart the time to set