code: private void labelIndicatorSetColorsToDefaultState(JLabel label) {
          if (label == null || settings == null) {
              return;
          }
          if (label == labelMonth || label == labelYear) {
              label.setBackground(settings.getColor(DateArea.BackgroundMonthAndYearMenuLabels));
              monthAndYearInnerPanel.setBackground(settings.getColor(DateArea.BackgroundMonthAndYearMenuLabels));
          }
          if (label == labelSetDateToToday) {
              label.setBackground(settings.getColor(DateArea.BackgroundTodayLabel));
          }
          if (label == labelClearDate) {
              label.setBackground(settings.getColor(DateArea.BackgroundClearLabel));
          }
          label.setBorder(new CompoundBorder(
              new EmptyBorder(1, 1, 1, 1), labelIndicatorEmptyBorder));
      }
docs: labelIndicatorSetColorsToDefaultState, This event is called to set a label indicator to the
  state it should have when there is no mouse hovering over it.