Skip to content
Clojure(Script) tagged literals for jsr-310 (java-time, java.time) entities
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.


A Clojure(Script) library which provides tagged literals for objects from jsr-310 domain, which on the jvm is objects from the java.time library and in Javascript is a 'jsr-310 clone' library (yes, it is actually an implementation of JSR-310, rather than joda-time, as it's name would suggest).

This enables copying and pasting these objects within the REPL and conveying these objects across process boundaries.

Pro-tip: The tick library is an intuitive Clojure(Script) library for dealing with time, intended as a replacement for clj-time. It bundles this library and enables time-literals printing by default.



Clojars Project

The library includes the magic file data_readers.cljc which Clojure and the Clojurescript compiler will look for.

In order to modify the printer to print these literals, run:



Example literals:

#time/month "JUNE"
#time/period "P1D"
#time/date "2039-01-01"
#time/date-time "2018-07-25T08:08:44.026"
#time/zoned-date-time "2018-07-25T08:09:11.227+01:00[Europe/London]"
#time/offset-date-time "2018-07-25T08:11:54.453+01:00"
#time/instant "2018-07-25T07:10:05.861Z"
#time/time "08:12:13.366"
#time/duration "PT1S"
#time/year "3030"
#time/year-month "3030-01"
#time/zone "Europe/London"
#time/day-of-week "TUESDAY"


For example, in a Clojure repl:

(require '
; Get a node repl going, or equivalent start figwheel and connect with sidecar etc 
(require '[cljs.repl :as cljs-repl])
(require '[cljs.repl.node :as node])          

(cljs-repl/repl* (node/repl-env)
  {:output-dir "out"
   :optimizations :none
   :cache-analysis true
   :source-map true})
 ;Now, in cljs repl
 (require '[java.time])  
 (println #time/duration "PT1S")
 ; => #object[Duration PT1S]
 ; Now, include printing and edn reading
 (require '[])
 (println #time/duration "PT1S")
 ; => #time/duration "PT1S"   
 Read an edn string:
 (cljs.reader/read-string "#time/date \"2011-01-01\"")     

Self-hosted Cljs



As with any non-core tagged literal, the tag reader functions referred to from a data_readers file must be loaded before the forms can be read.

(require '[])
(println #time/duration "PT1S")

Reading and Writing edn

(require '[])

Printing will now automatically change, for example re run the println above

Read edn like this:

(clojure.edn/read-string {:readers} "#time/date \"2011-01-01\"")

Using clojure.core/read-string, you'd need to eval after the call to read-string


If you only need Instant from java.time/jsr-310, you could just rebind the tag readers and printer fns for #inst

There is a similar library, java-time-literals but this currently only works on the jvm, and also doesn't provide a way to read edn with the literals (via clojure.edn/read-string or cljs.reader). The naming of tags in this library (time-literals) follows the tick convention, for example #time/date for LocalDate, instead of #time/ld as in java-time-literals.


Copyright © 2019 Widd Industries

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

You can’t perform that action at this time.
You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Reload to refresh your session.