Java OCP 21 (1Z0-830) | Handling Values 1.9 | Time Zones & DST — Spring Forward, Fall Back
Java OCP 21 Exam (1Z0-830) — Handling Values Series
Video 1.9 : Time Zones & Daylight Saving Time — Spring Forward, Fall Back
In this video you will learn:
✅ ZonedDateTime — the full package: date + time + zone
✅ ZoneId.of() — IANA format: "Europe/London", "Asia/Kolkata"
✅ ZonedDateTime.now(zone) and ZonedDateTime.of() factory methods
✅ UTC offset in ZonedDateTime output — what +01:00 means
✅ DST Spring Forward — UK 2025: 01:59 jumps to 03:00 on 30 March
✅ The GAP — hour 02:00 to 02:59 does NOT exist on that day
✅ What Java does with a time in the gap — NO exception thrown
✅ 02:30 automatically adjusted to 03:30 — the exact exam answer
✅ DST Fall Back — UK 2025: 02:00 goes back to 01:00 on 26 October
✅ The OVERLAP — hour 01:00 to 01:59 exists TWICE on that day
✅ Java uses the EARLIER offset — UTC+1, the first occurrence
✅ getOffset() returns +01:00 for ambiguous times
✅ Adding hours across DST boundary — why midnight + 4 hours = 05:00
✅ ZonedDateTime tracks wall clock time including DST jumps
✅ Instant vs ZonedDateTime for time arithmetic — key difference
✅ Two DST rules to memorise for the exam
🎯 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...
📝 Practice Questions:
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