private static void sortListDateTime(List<LocalDateTime> list) {

    long start = System.nanoTime();
    Collections.sort(list);
    long end = System.nanoTime();
    System.out.println("LocalDT:   Sort:   " + NF.format(end - start) + " ns " + list.get(0));
    result("LocalDT-S", end - start);
  }