code: public static final Renderer<Date> instance() { // NOPMD it's thread save!
      if (MonthRenderer.instanceRenderer == null) {
        synchronized (MonthRenderer.class) {
          if (MonthRenderer.instanceRenderer == null) {
            MonthRenderer.instanceRenderer = new MonthRenderer("yyyy-MM");
          }
        }
      }
      return MonthRenderer.instanceRenderer;
    }
docs: returns the instance.
  
  @return Renderer