Clojure Time
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Clojure Time

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 Author

Paul Legato
Paul Legato

Paul Legato has been working in Clojure since 2008, by way of Common Lisp, Scheme, and Ruby.

Table of Contents

  • Introduction
    • About the Cover:
  • Preview Edition
  • Preface: Environmental Setup
    • Java version 8 or higher
    • clojure.java-time Wrapper Library and ThreeTen-Extra Extensions
    • Add clojure.java-time to your namespace
    • Mix clojure.java-time and Direct Java Calls Freely
  • The java.time Conceptual Model
    • Brief Introduction to Timezones
    • The Timeline: an Instant in time
    • 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 clojure.java-time?
  • Examples
  • 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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