code: public List<Change> asAddedChanges() {
          final List<Change> changes = new ArrayList<>();
          for (final HourRange hr : hourRanges) {
              changes.add(new Change(ChangeType.ADDED, dayOfTheWeek, hr));
          }
          return changes;
      }
docs: Returns all hour ranges of this day as if they were added.
  
  @return Added day changes.