Unit 5: Java Date and Time API - Practice Quiz

1 Which Java class represents a date without a time or time zone?

2 Which method adds a specified number of days to a LocalDate?

3 Which method creates a LocalDate from a specific year, month, and day?

4 What does LocalDate.now() return?

5 Which Java class represents a time without a date or time zone?

6 Which method adds minutes to a LocalTime object?

7 Which method creates a LocalTime from hour and minute values?

8 What does LocalTime.now() return?

9 Which class combines a date and a time without storing a time zone?

10 Which method combines a LocalDate and a LocalTime into a LocalDateTime?

11 Which method extracts the date part from a LocalDateTime?

12 Which method extracts the time part from a LocalDateTime?

13 Which Java class represents a date and time with a time-zone ID?

14 Which class represents a time-zone identifier such as Europe/Paris?

15 Which method attaches a time zone to a LocalDateTime?

16 Which Java class represents a point on the global timeline?

17 Which class is used to represent an amount of date-based time such as years, months, and days?

18 Which class represents a time-based amount such as hours, minutes, and seconds?

19 Which class is used to format and parse Java date and time objects?

20 Which method creates a DateTimeFormatter from a pattern such as dd-MM-yyyy?

21 A conference occurs annually on March 15. Which expression creates the date for the 2026 conference?

22 A subscription starts on 2025-01-31 and must be renewed on the same day of the month whenever possible. What is the result of start.plusMonths(1)?

23 Which condition correctly checks whether an event date occurs within the inclusive range from startDate through endDate?

24 A project begins on 2024-02-28 and ends on 2024-03-05. Which value represents the number of elapsed days between the two dates?

25 A task starts at 09:45 and lasts 2 hours and 30 minutes. Which expression calculates its ending time?

26 What is the result of evaluating LocalTime.of(23, 30).plusMinutes(90)?

27 Which method is most appropriate for checking whether a meeting time is before another meeting time?

28 A system records a daily backup at 22:15 and needs to run it every 6 hours. Which object best represents this repeating time interval?

29 Which expression combines the date 2026-04-10 and the time 14:30 into a LocalDateTime?

30 A deadline is stored as LocalDateTime deadline. Which expression adds three calendar days while preserving the local time?

31 Which statement about a LocalDateTime is correct when scheduling an event for users in different regions?

32 What is the result of LocalDateTime.of(2025, 8, 20, 10, 0).toLocalDate()?

33 A meeting is scheduled at 09:00 in America/New_York. Which expression creates a zoned date-time for July 1, 2026?

34 A ZonedDateTime represents an event in Tokyo. Which operation converts it to the equivalent local time in London while preserving the same instant?

35 Why is ZoneId generally preferred over a fixed offset such as +02:00 for recurring events tied to a region?

36 Which object is most appropriate for recording the exact moment when a transaction was received by a server?

37 What does Duration.between(LocalTime.of(8, 15), LocalTime.of(10, 45)).toMinutes() return?

38 Which statement correctly distinguishes Period from Duration?

39 What is the result of adding Period.ofMonths(1) to LocalDate.of(2024, 1, 31)?

40 Which formatter pattern produces output such as 2026/07/04 09:05 for a LocalDateTime?

41 What does the following code print?

LocalDate d = LocalDate.of(2024, 1, 31);

System.out.println(d.plusMonths(1).plusMonths(1) + " | " + d.plusMonths(2));

42 Given LocalDate date = LocalDate.of(2025, 2, 10);, what is produced by date.with(TemporalAdjusters.lastDayOfMonth()).with(TemporalAdjusters.nextOrSame(DayOfWeek.MONDAY))?

43 A yearly event is represented by MonthDay.of(2, 29). What does event.atYear(2023) return?

44 What is the result of ChronoUnit.MONTHS.between(LocalDate.of(2024, 1, 31), LocalDate.of(2024, 3, 30))?

45 What does Duration.between(LocalTime.of(23, 30), LocalTime.of(0, 15)) produce?

46 Given LocalTime t = LocalTime.of(12, 34, 56, 987_654_321);, which expression evaluates to 12:34:56.987?

47 What is the result of the following expression?

LocalDateTime.of(LocalDate.of(2024, 12, 31), LocalTime.MAX).plusNanos(1)

48 In Europe/Berlin, the local time 2024-03-31T02:30 lies inside a daylight-saving gap. What does LocalDateTime.of(2024, 3, 31, 2, 30).atZone(ZoneId.of("Europe/Berlin")) produce?

49 Which statement about LocalDateTime is correct when modeling a globally unique scheduled execution?

50 Consider the two occurrences of 2024-11-03T01:30 in America/New_York during the DST overlap. If earlier uses the earlier offset and later uses the later offset, what is Duration.between(earlier, later)?

51 Let z be 2024-01-15T10:00+09:00[Asia/Tokyo]. Which operation creates a Paris value representing the same instant?

52 Given

OffsetDateTime a = OffsetDateTime.parse("2024-01-01T10:00+02:00");

OffsetDateTime b = OffsetDateTime.parse("2024-01-01T08:00Z");

which statement is true?

53 A fixed clock is created as follows:

Clock c = Clock.fixed(Instant.parse("2024-01-01T00:30:00Z"), ZoneOffset.UTC);

Which pair is returned by LocalDate.now(c.withZone(ZoneId.of("America/Los_Angeles"))) and LocalDate.now(c.withZone(ZoneId.of("Asia/Tokyo"))), respectively?

54 In America/New_York, let start be 2024-03-09T12:00-05:00. Which result correctly compares start.plus(Period.ofDays(1)) with start.plus(Duration.ofDays(1))?

55 What does Instant.ofEpochSecond(1, 1_500_000_000) return?

56 What is the result of Period.of(1, 15, 40).normalized()?

57 What happens when Duration.between(LocalDate.of(2024, 1, 1), LocalDate.of(2024, 1, 2)) is evaluated?

58 Two ZonedDateTime values in America/New_York represent noon on March 9 and noon on March 10, 2024. What are the results of ChronoUnit.DAYS.between(start, end) and Duration.between(start, end).toHours()?

59 What happens when the following code is executed?

DateTimeFormatter f = DateTimeFormatter.ofPattern("yyyy-MM-dd").withResolverStyle(ResolverStyle.STRICT);

LocalDate.parse("2024-02-29", f);

60 A formatter is defined by DateTimeFormatter.ofPattern("uuuu-MM-dd HH:mm XXX VV"). What does it produce for ZonedDateTime.of(2024, 7, 1, 9, 5, 0, 0, ZoneId.of("Asia/Kolkata"))?