OCP Date, Time, and Localization

Question 1

What is the result of executing `LocalDate.of(2024, Month.FEBRUARY, 29)`?

Accepted Answer

Returns 2024-02-29 because 2024 is a leap year

Answer

2024 is a leap year, making February 29 a valid date, so LocalDate.of(2024, Month.FEBRUARY, 29) successfully creates 2024-02-29.

Question 2

Which Java class represents a date and time without any time-zone information?

Accepted Answer

LocalDateTime

Answer

LocalDateTime stores a date-time without any zone or offset, while ZonedDateTime includes a zone, Instant is epoch-based, and OffsetDateTime carries a UTC offset.

Question 3

What does `Period.between(LocalDate.of(2023, 1, 1), LocalDate.of(2024, 3, 15))` return when printed?

Accepted Answer

P1Y2M14D

Answer

Period stores years, months, and days separately; from January 1 2023 to March 15 2024 is exactly 1 year, 2 months, and 14 days.

Question 4

Which method correctly obtains the current date using the UTC time zone?

Accepted Answer

LocalDate.now(ZoneId.of("UTC"))

Answer

LocalDate.now(ZoneId.of("UTC")) explicitly passes the UTC zone to get the current date in that zone, whereas the no-arg now() uses the JVM default zone.

Question 5

Which of the following correctly creates a Duration of 2 hours and 30 minutes?

Accepted Answer

Both options produce the same valid Duration

Answer

Both Duration.of(2, ChronoUnit.HOURS).plusMinutes(30) and Duration.ofHours(2).plus(30, ChronoUnit.MINUTES) are valid fluent ways to build a 2h30m Duration.

(OCP) Oracle Certified Professional Practice Test

(OCP) Oracle Certified Professional Practice Test

OCP Date, Time, and Localization