code: public static Date addWorkingDaysToDate(Date date, int days) {
  		Calendar cal = dateToCalendar(date);
  
  		for (int i = 0; i < days; i++) {
  			cal.add(Calendar.DATE, 1);
  			while (!isWorkingDay(cal)) {
  				cal.add(Calendar.DATE, 1);
  			}
  		}
  
  		return cal.getTime();
  	}
docs: Adds the given number of working days to the given date. A working day is
  specified as a regular Norwegian working day, excluding weekends and all
  national holidays.
  <p/>
  Example 1:<br/>
  - Add 5 working days to Wednesday 21.03.2007 -> Yields Wednesday
  28.03.2007. (skipping saturday and sunday)<br/>
  <p/>
  Example 2:<br/>
  - Add 5 working days to Wednesday 04.04.2007 (day before
  easter-long-weekend) -> yields Monday 16.04.2007 (skipping 2 weekends and
  3 weekday holidays).
  
  @param date
  The original date.
  @param days
  The number of working days to add.
  @return The new date.