StudyToCert

All certifications / OCP Java / Lessons

Oracle Certified Professional: Java SE Developer 1Z0-831 (Java SE 25) · Domain 1: Handling date, time, text, numeric and boolean values

Date-Time API: LocalDate, LocalTime, LocalDateTime, ZonedDateTime, Instant

▶ Watch the overview video

Last reviewed September 25, 2026 · Leer en español

The java.time package is Java's modern date and time API. Its classes are immutable and thread-safe, and none of them have public constructors: you create values with static factory methods such as now(), of(...) and parse(...). Because they are immutable, every method that seems to change a value, like plusDays, returns a new object. Forgetting to assign that result is the most common exam trap, exactly as with String.

Free account

Keep reading for free

Create a free StudyToCert account to read the rest of this lesson: 6 more sections, 4 key terms, a real-world example, an exam tip and self-check questions. Every lesson, lab and practice test is free with an account.

Sign up free Log in

Study OCP Java for free
A week-by-week plan with every lesson, quizzes, checkpoint tests, a practice exam and hands-on labs.
Open the OCP Java study plan