private static void formatListInstant(List<Instant> list) {

    StringBuilder buf = new StringBuilder();
    long start = System.nanoTime();
    for (Instant dt : list) {
      buf.setLength(0);
      buf.append(dt.toString());
    }
    long end = System.nanoTime();
    System.out.println("Instant:   Format: " + NF.format(end - start) + " ns" + " " + buf);
    result("Instant-P", end - start);
  }