code: public void addDefaultCalendarHours(Day day)
     {
        ProjectCalendarHours hours = addCalendarHours(day);
  
        if (day != Day.SATURDAY && day != Day.SUNDAY)
        {
           hours.addRange(DEFAULT_WORKING_MORNING);
           hours.addRange(DEFAULT_WORKING_AFTERNOON);
        }
     }
docs: This is a convenience method used to add a default set of calendar
  hours to a calendar.
  
  @param day Day for which to add default hours for