Java OCP 21 (1Z0-830) | Handling Values 1.10 | DateTimeFormatter — Formatting & Parsing
Java OCP 21 Exam (1Z0-830) — Handling Values Series
Video 1.10 : DateTimeFormatter — Formatting & Parsing
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In this video you will learn:
✅ DateTimeFormatter.ofPattern() — creating a custom formatter
✅ Formatting direction — date.format(formatter) produces a String
✅ Decoding dd-MM-yyyy pattern character by character
✅ dd = 2-digit day, MM = 2-digit month, yyyy = 4-digit year
✅ MMM = Mar (abbreviation), MMMM = March (full name)
✅ HH = 24-hour clock (0-23), hh = 12-hour clock (1-12)
✅ Using LocalDate vs LocalDateTime with time patterns
✅ Predefined formatters — ISO_LOCAL_DATE and when to use them
✅ LocalDate.parse(string) — one-arg uses ISO default yyyy-MM-dd
✅ LocalDate.parse(string, formatter) — two-arg uses custom pattern
✅ DateTimeParseException at runtime — mismatch between string and pattern
✅ PATTERN CASE SENSITIVITY — the #1 exam trap on this topic
✅ M = month number, m = minute — one letter, completely different meaning
✅ H = 24-hour (0-23), h = 12-hour (1-12)
✅ d = day of month, D = day of year (1-365)
✅ y = calendar year, Y = week-based year
✅ The compile-and-fail trap — wrong pattern compiles, crashes at runtime
✅ "dd-mm-yyyy" looks correct but throws DateTimeException — can you see why?
🎯 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 — Time Zones & DST — Spring Forward, Fall Back:
➡ Next — Compact Number Formatting:
📝 Practice Questions:
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