code: @Nonnull
    public CronTrigger build ()
    {
      final CronTrigger ct = new CronTrigger ();
      ct.setCronExpression (m_aCronExpression);
      ct.setTimeZone (m_aCronExpression.getTimeZone ());
      ct.setMisfireInstruction (m_nMisfireInstruction);
      return ct;
    }
docs: Build the actual Trigger -- NOT intended to be invoked by end users, but
  will rather be invoked by a TriggerBuilder which this ScheduleBuilder is
  given to.
  
  @see TriggerBuilder#withSchedule(IScheduleBuilder)