Getting Started with Date/Time Manipulation in Clojure
About the Book
Quickly learn the building blocks needed to construct systems that do complex date and time manipulations. Unravel the dark mysteries that enable effortless transformations of timezones as they attach to the timeline and complex, ever-shifting daylight savings times rulesets.
Readers who have some familiarity with Clojure, but no prior experience with `java.time` or any other time APIs can quickly come up to speed with a little theoretical overview. The book then becomes a design pattern reference manual: a catalog of worked demonstration problems modeling various time/date scenarios become the building blocks for your more complex date/time system.
This is an early preview edition -- feedback is welcome! Tell me what sorts of demo material would be helpful.
- About the Cover:
- Preview Edition
Preface: Environmental Setup
- Java version 8 or higher
clojure.java-timeWrapper Library and ThreeTen-Extra Extensions
clojure.java-timeto your namespace
clojure.java-timeand Direct Java Calls Freely
- Brief Introduction to Timezones
The Timeline: an
Duration: Length of Time as Number of Seconds
Period: Length of Time as Days, Months, and Years
ZoneId: A Timezone – Rules to Map Between UTC and Local Time
LocalTime: Importunely Named Abstract Time of Day
LocalDate: importunely named representation of an abstract date
ZonedDateTime: a date + a time + a timezone
- Interval: Timespan Between Two Instants
- Offsets from UTC
- Brief overview of the history of time manipulation in Clojure
Bare Java versus
- Convert Times Between Timezones
- Find the Number of Days Between Two Dates
- Find Gaps in a Set of Intervals
- Find Overlaps in a Set of Intervals
- Perpetual Calendar of Business Days as Lazy Seq
- Appendix: Code License
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