Possible typo in answer of question 68 in chapter 1 (Practice Tests)

[Albert Attard]

Hello

I think there is a typo in the answer for question 68 in chapter 1.  

C.  Normally, adding an hour would result in `02:00` in the same time zone offset of `-05:00`.  Since the hour is repeated, it is `01:00` again.  However, the time zone offset changes instead. Therefore, option C is correct.

The question indicates that the time is 2012-11-06T01:00-04:00[America/New_York], which has a time zone offset of -04:00, and not -05:00 as the answer indicated.

[Stephan van Hulst]

I don't have the book so I don't know if I'm interpreting the answer correctly, but the difference you're seeing seems to be explained by the answer. Emphasis mine:

C.  Normally, adding an hour would result in `02:00` in the same time zone offset of `-05:00`.  Since the hour is repeated, it is `01:00` again.  However, the time zone offset changes instead. Therefore, option C is correct.

[Albert Attard]

Thank you for your reply.

The question reads like this.

Daylight saving time ends on November 6, 2022 at 2 a.m., when we repeat the hour. Suppose we have a ZonedDateTime that outputs 2012-11-06T01:00-04:00[America/New_York] when calling toString(). What is a possible value of the ZonedDateTime obtained by adding an hour to this value?

Unless I am misunderstanding the answer, it is saying that on any other given day, the hour would move by 1 while the time zone offset will not change and stay as is, -5:00 in this case.  But based on the question, the time zone offset is -4:00 and not -5:00.

[Stephan van Hulst]

I see the issue. There is an error in the question and an error in the answer.

The question mentions a ZonedDateTime that outputs "2012-11-06T01:00-04:00[America/New_York]". The intended year was probably 2022, because in 2012 daylight savings already ended on the 4th of november in New York.

The answer says that the offset is -05:00, however the offset during daylight savings time in New York is -04:00. The offset will only be -05:00 when daylight savings time ends, an hour later.

So yes, you're correct. Consider this small application:

var dateTime = ZonedDateTime.of(
  LocalDateTime.of(
    LocalDate.of(2022, NOVEMBER, 6),
    LocalTime.of(1, 0)
  ),
  ZoneId.of("America/New_York")
);

System.out.println(dateTime);

System.out.println(dateTime.plusHours(1));

This outputs the following:
2022-11-06T01:00-04:00[America/New_York] 2022-11-06T01:00-05:00[America/New_York]

[Albert Attard]

You are right.  I tried the same example, and I thought I copied the wrong date and fixed it in my example without checking the question again.

For completeness there are four options in the answers, all with year 2022.

A. 2022-11-06T01:00-04:00[America/New_York]
B. 2022-11-06T02:00-04:00[America/New_York]
C. 2022-11-06T01:00-05:00[America/New_York]
D. 2022-11-06T02:00-05:00[America/New_York]

I checked again after reading your message and now I realised why this didn’t work as expected in my first try.  Thank you for pointing it out.

[Jeanne Boyarsky]

I logged 2012 vs 2022 in the errata. What's wrong with the answer?