code: public long getNextIncludedTime (final long timeStamp)
    {
      if (timeStamp <= 0)
        throw new IllegalArgumentException ("timeStamp must be greater 0");
  
      if (m_aBaseCalendar != null)
      {
        return m_aBaseCalendar.getNextIncludedTime (timeStamp);
      }
  
      return timeStamp;
    }
docs: <p>
  Determine the next time (in milliseconds) that is 'included' by the
  Calendar after the given time. Return the original value if timeStamp is
  included. Return 0 if all days are excluded.
  </p>
  
  @see com.helger.quartz.ICalendar#getNextIncludedTime(long)