code: private static boolean isWorkingDay(Calendar cal) {
  		return cal.get(Calendar.DAY_OF_WEEK) != Calendar.SATURDAY && cal.get(Calendar.DAY_OF_WEEK) != Calendar.SUNDAY
  				&& !isHoliday(cal);
  	}
docs: Will check if the given date is a working day. That is check if the given
  date is a weekend day or a national holiday.
  
  @param cal
  The Calendar object representing the date.
  @return true if the given date is a working day, false otherwise.