DateTimeFormatter format8 =
      DateTimeFormatter.ofPattern("EEEE, dd MMMM yyyy HH:mm:ss z");

ZonedDateTime zs8 = LocalDateTime.of(2014, 3, 29, 20, 10, 5).atZone(ZoneId.of("Europe/Paris"));
System.out.format("Before the clock advances\t: %s\n", zs8.format(format8));

Duration period = Duration.ofHours(25);

ZonedDateTime later8 = zs8.plus(period);
System.out.format("25 hours later \t: %s\n", later8.format(format8) );