private static void formatListZonedDateTime(List<ZonedDateTime> list) {

    StringBuilder buf = new StringBuilder();
    DateTimeFormatter format = DateTimeFormatters.isoDate().withLocale(Locale.ENGLISH);
    long start = System.nanoTime();
    for (ZonedDateTime dt : list) {
      buf.setLength(0);
      buf.append(format.print(dt));
    }
    long end = System.nanoTime();
    System.out.println("ZonedDT:   Format: " + NF.format(end - start) + " ns" + " " + buf);
    result("ZonedDT-P", end - start);
  }