code: public boolean isWorkingDate(Date date)
     {
        Calendar cal = DateHelper.popCalendar(date);
        Day day = Day.getInstance(cal.get(Calendar.DAY_OF_WEEK));
        DateHelper.pushCalendar(cal);
        return isWorkingDate(date, day);
     }
docs: This method allows the caller to determine if a given date is a
  working day. This method takes account of calendar exceptions.
  
  @param date Date to be tested
  @return boolean value