Java OCP 21 (1Z0-830) | Handling Values 1.6 | Date-Time API — LocalDate, LocalTime & LocalDateTime
Java OCP 21 Exam (1Z0-830) — Handling Values Series
Video 1.6 : Date-Time API — LocalDate, LocalTime & LocalDateTime
In this video you will learn:
✅ Why java.time replaced java.util.Date and java.util.Calendar
✅ The zero-indexed month trap in old Calendar — why it caused bugs
✅ LocalDate — date only, no time, no zone
✅ LocalTime — time only, no date, no zone
✅ LocalDateTime — date + time combined, no zone
✅ ALL three classes are immutable — methods return NEW objects
✅ Static factory methods — LocalDate.of(), LocalTime.of(), LocalDateTime.of()
✅ Why there is no 'new' keyword — constructors are private
✅ Month enum vs int month — Month.MARCH vs 3
✅ Months are 1-indexed in java.time — January=1, not 0
✅ Invalid values compile fine but throw DateTimeException at runtime
✅ LocalTime.of() overloads — 2, 3 and 4 argument versions
✅ LocalDateTime.of() — combining existing LocalDate and LocalTime objects
✅ Navigation — plusDays(), plusMonths(), minusYears(), withDayOfMonth()
✅ plusXxx vs withXxx — relative vs absolute — key exam distinction
✅ Tracing a full navigation chain step by step
✅ Month boundary handling — plusDays() across month end
✅ Querying — getYear(), getMonthValue(), getMonth(), getDayOfWeek()
✅ getMonthValue() returns int 1-12 — NOT 0-indexed
✅ getMonth() returns Month enum — MARCH, not 3
✅ getDayOfWeek() returns DayOfWeek enum — TUESDAY, not int
✅ isLeapYear() and lengthOfMonth()
✅ The immutability trap — navigation result discarded if not assigned
🎯 OCP 21 Exam Objective:
"Manipulate date, time, duration, period, instant and time-zone objects
including daylight saving time using the Date-Time API"
📺 Full OCP 21 Handling Values playlist:
• COMPLETE Java fundamentals and Java OCP 21...
⬅ Previous — Text Blocks — Whitespace Rules & Escape Sequences:
• Java OCP 21 (1Z0-830) | Handling Values 1....
➡ Next — Period, Duration & Instant:
📝 Practice Questions:
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