code: @Test public void daylightSavingFallFirstHour() throws Exception {
    Clock testingClock=new DefaultClockImpl();
    testingClock.setCurrentCalendar(parseCalendar("20131103-05:45:00",TimeZone.getTimeZone("UTC")));
    Calendar easternTime=testingClock.getCurrentCalendar(TimeZone.getTimeZone("US/Eastern"));
    DurationHelper dh=new DurationHelper("R2/2013-11-03T01:45:00-04:00/PT1H",testingClock);
    assertEquals(parseCalendar("20131103-06:45:00",TimeZone.getTimeZone("UTC")),dh.getCalendarAfter(easternTime));
  }
  