Java Time API with Clojure

Start with the Practicalli Clojure syntax page at practical.li/clojure/reference/clojure-syntax/more-java-fun.html and the Reference > Standard Library section. Review tick, cljc.java-time, time-literals, and clojure.java-time, then add the Date Time section with the requested examples, comparisons, dependency guidance, and selection summary. Done means the reference explains direct Java Time API use and the relevant library choices.

Projects

• juxt/tick - time as a value (uses cljc.java-time and time-literals projects under the covers)
• https://github.com/henryw374/cljc.java-time - library for Clojure and ClojureScript projects, with kebab-case named vars and predicate functions
• time-literals
• clojure.java-time - a simple wrapper around the Java Time API

Deprecated projects

• clj-time/clj-time
• joda-time (used as the basis for Java TIme API) - deprecated since Java 8 introduced the Java Time API

References

• https://blog.joda.org/2014/11/converting-from-joda-time-to-javatime.html

Practicalli pages to update

https://practical.li/clojure/reference/clojure-syntax/more-java-fun.html

TODO: Add Date Time section to Reference > Standard Library section

• use juxt/tick as the defacto library for both Clojure and ClojureScript projects (tick uses cljc.java-time under the hood)
• add any meaningful comparisions to using cljc.java-time or juxt/tick
• examples of using Clojure.java-time and Java Time API
  • using Java Time API directly removed the need for a library dependency
• summary of why to choose one of the mentioned projects

clojure.java-time example

Add clojure.java-time to project deps.edn file

{:paths ["src"]
 :deps {org.clojure/clojure {:mvn/version "1.10.1"}
            clojure.java-time {:mvn/version "0.3.2"}}}

Require java-time namespace.
call local-date-time to get the date and time when the function was called

(ns practicalli.what-time-is-it
  (:require [java-time :as time]))

(defn -main []
  (println "The time according to Clojure java-time is:"
           (time/local-date-time)))