Date time java 8 (jsr 310)
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The document presents an overview of the new Java Date Time API (JSR-310) introduced in Java 8, highlighting the improvements over the old datetime handling methods. It discusses the issues with the previous API, demonstrates new features through code examples, and provides insights on various classes and methods within the new API. Additionally, it includes resources for further exploration of the new date-time functionality in Java.
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Date time java 8 (jsr 310)
- 1. Date Time Java 8 (JSR-310) ilJUG – July 2014 By: Eyal Golan Tech Lead at eBay
- 2. A word before starting… The intent of this presentation is to be basic source and starting point to the new Java Date Time API (JSR-310) 2
- 3. Agenda • Old vs. New • JSR 310 • Examples by code • Resources 3
- 4. Old Issues • Date is not a date, nor time. It’s an instant in time (by epoch) • Calendar is Date and Time • Month is 0 (zero) based • Mutability 4
- 7. Example – Issues 7 First try=1274 , second try=0 Use (Calendar)start.clone();
- 8. Calendar • YEAR, MONTH, DAY_OF_MONTH… • Fields start at 0 • Calendar is mutable • Methods (set, add…) change the state of Calendar 8
- 9. Example – The New Way 9 1274
- 10. Example – The New Way 10 1274
- 11. Example – The New Way 11 1274
- 12. Example – The New Way 12 Today 2014-07-29 and next year 2015-07-29
- 13. Modeling • Different date/time scenarios • Class starts at 12:30 • ilJUG is on 29th July • The presentation is 1 hour long • I’ve been working at eBay for 3 years and 6 months 13
- 15. Example – The New Way 15
- 16. Example – The New Way 16
- 17. Amount of Time • How many milliseconds it took between request to response? • Set time 10 seconds after now • Calculate time that passed between two events 17
- 18. Example – Old Calculation 18 now Tue Jul 29 01:48:56 IDT 2014 and later Thu Jan 01 04:20:00 IST 1970
- 19. Example – Old Calculation 19 119 days 6 hours 13 minutes 24 seconds 543 ms Example taken from stackoverflow
- 21. Duration – Machine Time 21 now 2014-07-28T23:17:40.898Z and later 2014-07-29T01:47:40.898Z 150 2014-07-28T23:17:53.898Z 9000000
- 22. Period – Human Time 22
- 24. Guidelines • Clear • Fluent • DSL • Immutability • Amount of time, different representations for different cases • Human (year, month, day) • Machine time 24
- 25. Packages • java.time • java.time.chrono • java.time.format • java.time.temporal • java.time.zone 25
- 26. Some (not all) Classes • Temporal – Basic interface for DateTime classes • LocalDate / LocalTime / LocalDateTime … • Instant • Start of nanoseconds in timeline. Useful for timestamp • Clock • Allowing Temporal creation with alternate clock • TemporalAmount – Basic interface for classes that represent amount of time • Duration • Period 26
- 27. Methods Naming Conventions of Static Creates an instance with validation to Instance Converts to another type (truncate fields) at Instance Combines this object with another (expands) from Static Converts input parameters to an instance get Instance Part of the state of the object 27
- 28. Methods Naming Conventions is Instance Queries state of an object with Instance Returns a copy of an object with one changed element plus / minus instance Returns a copy of an object with amount of added / subtracted time parse Static Parses input string to an instance format Instance Uses formatter to format the object’s values to produce a string 28
- 34. The Basics 34
- 35. Basic Date and Time 35
- 36. Partial Dates & Information 36
- 39. Time Zone 39
- 40. Using Zone 40
- 41. Instant 41 From Javadoc: "This class models a single instantaneous point on the time-line. This might be used to record event time-stamps in the application... "...number of seconds that can be held in a long. This is greater than the current estimated age of the universe... "...The instant is stored to nanosecond resolution..."
- 42. Adjusters • Take Temporal value and adjust it • Pre defined • firstDayOfMonth • firstDayOfYear • lastInMonth • Look at TemoralAdjusters • Custom adjusters 42
- 43. Adjusters 43
- 45. Queries – Retrieve Information 45
- 48. Parsing and Formatting • DateTimeFormatter • Many pre defined formats • http://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html#predefined • Immutable • DateTimeFormatterBuilder • All classes use the same way • DateTimeParseException (runtime) 48
- 50. Legacy Date Time Integration 50