code: public boolean isTimeIncluded (final long timeStamp)
    {
  
      if (timeStamp <= 0)
      {
        throw new IllegalArgumentException ("timeStamp must be greater 0");
      }
  
      if (m_aBaseCalendar != null)
      {
        if (m_aBaseCalendar.isTimeIncluded (timeStamp) == false)
        {
          return false;
        }
      }
  
      return true;
    }
docs: <p>
  Check if date/time represented by timeStamp is included. If included return
  true. The implementation of BaseCalendar simply calls the base calendars
  isTimeIncluded() method if base calendar is set.
  </p>
  
  @see com.helger.quartz.ICalendar#isTimeIncluded(long)