The correct answer is Option D, which uses `ZonedDateTime.of(2024,3,10,2,30,0,0,ZoneId.of("America/New_York")).withZoneSameInstant(ZoneOffset.UTC)`. This is correct because it explicitly constructs a `ZonedDateTime` for the local time 2:30 AM in the America/New_York timezone and then converts to UTC using `withZoneSameInstant`, which properly handles the DST gap. On March 10, 2024, at 2:30 AM, clocks in New York jumped forward to 3:30 AM EDT (UTC-4), meaning the equivalent UTC time is 6:30 AM—not 2:30 AM UTC. This question tests your understanding of `ZonedDateTime` DST gap conversion, a frequent exam trap on the Oracle Certified Professional Java SE 17 Developer 1Z0-829. Candidates often mistakenly use `ZoneOffset.ofHours(-5)` or assume the local time remains valid during a gap. Remember the memory tip: “Gap means jump—use `withZoneSameInstant` to find the real instant, not the wall clock.”
1Z0-829 Practice Question: Handling Date, Time, Text, Numeric and Boolean Values
This 1Z0-829 practice question tests your understanding of handling date, time, text, numeric and boolean values. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
SELECT FROM_TZ(TIMESTAMP '2024-03-10 02:30:00', 'America/New_York') AT TIME ZONE 'UTC' FROM DUAL;
Output: 10-MAR-24 07.30.00.000000 UTC
Refer to the exhibit. Which Java code correctly performs the equivalent timezone conversion?
Option D is correct because it explicitly constructs a ZonedDateTime for the given date and time in the America/New_York timezone, then converts it to UTC using withZoneSameInstant. This correctly accounts for the fact that on March 10, 2024, at 2:30 AM, clocks in New York were set forward to 3:30 AM EDT (UTC-4), so the equivalent UTC time is 6:30 AM, not 2:30 AM UTC.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Correct: withZoneSameInstant converts to UTC while preserving the instant.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the misconception that a simple UTC offset or LocalDateTime can be used to represent a time that falls within a DST gap, when in fact you must use ZonedDateTime with the correct ZoneId to trigger the proper offset adjustment.
Detailed technical explanation
How to think about this question
Under the hood, ZonedDateTime uses the ZoneRules of the provided ZoneId to determine the offset at the given local date-time. For America/New_York on March 10, 2024, at 2:30 AM, the rules indicate a gap (spring-forward) from 2:00 AM EST (UTC-5) to 3:00 AM EDT (UTC-4), so the local time 2:30 AM does not exist; the ZonedDateTime constructor adjusts to 3:30 AM EDT, which is 6:30 AM UTC. This behavior is defined by the IANA Time Zone Database and is crucial for correctly handling DST transitions in scheduling applications.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 1Z0-829 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Handling Date, Time, Text, Numeric and Boolean Values — This question tests Handling Date, Time, Text, Numeric and Boolean Values — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ZonedDateTime.of(2024,3,10,2,30,0,0,ZoneId.of("America/New_York")).withZoneSameInstant(ZoneOffset.UTC) — Option D is correct because it explicitly constructs a ZonedDateTime for the given date and time in the America/New_York timezone, then converts it to UTC using withZoneSameInstant. This correctly accounts for the fact that on March 10, 2024, at 2:30 AM, clocks in New York were set forward to 3:30 AM EDT (UTC-4), so the equivalent UTC time is 6:30 AM, not 2:30 AM UTC.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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