cljs.java.time

A Clojurescript library that provides the jsr-310 (java.time) api.

Note: this is not a wrapper library, meaning there are not additional Clojurescript functions, only what java.time provides.

Underneath this lib is a pure JS implementation of java.time. This extends that by adding Clojurescript's equivalence, hash and comparison protocols to the java.time domain objects, providing externs and having the packages of java.time be mirrored by namespaces.

Related Libraries

cljc.java-time offers a one for one mapping of the classes and methods from java.time into a Clojure(Script) library

Using that library is tick, an intuitive Clojure(Script) library for dealing with time, intended as a replacement for clj-time.

time-literals is a Clojure(Script) library which provides tagged literals for objects from jsr-310 domain and depends on this library

my talk at Clojure/North 2019 provides some background

Usage

get it from Clojars

(require '[java.time :refer [LocalDate]])

(.parse LocalDate "2020-01-01")

If you would like to be able to use = and sort with the java.time objects

(require 'cljs.java-time.extend-eq-and-compare)

Cross Platform (.cljc) Example

(ns foo
  (:require
    #?(:cljs [java.time :refer [LocalDate]])
    [time-literals.read-write]
    [cljs.java-time.interop :as t.i])
   #?(:clj (:import [java.time LocalDate])))
   
   
  (. LocalDate parse "2020-12-01")
  ;=> #time/date"2020-12-01"
  
  (= 
    (. LocalDate parse "2020-12-01")
    (. LocalDate parse "2020-12-01"))
  ; => true  
  
  ; call a getter method
  (let [l (. LocalDate parse "2020-12-01")]
    (t.i/getter dayOfMonth l))
  

Getter Methods

Unfortunately, all java.time getter methods have had the 'get' part of their name removed in the underlying js lib. So instead of 'getNano' method, you have 'nano'. As a workaround, to write cross platform code that calls any getter methods on java.time objects, use the cljs.java-time.interop/getter macro

Shadow Cljs

The npm library that provides the jsr-310 api is provided via Cljsjs, foreign-libs. To make this work with Shadow, add the following dependency:

[thheller/shadow-cljsjs "0.0.16"]

See this demo for more info

License

Copyright © 2019 Widd Industries

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.