Clojurescript

TL;DR if you’re working with timezones and/or need to create custom formatters from patterns, such as "dd MMM yyyy"

add the following to your dependencies:

and add this to your cljs code somewhere before timezones and locales are used

(ns xyz

(:require [tick.alpha.api] [cljsjs.js-joda-timezone] [henryw374.js-joda-locale-en-us]))

(set! js/JSJoda (.use js/JSJoda js/JSJodaLocale))

Tick uses the js-joda library, which aims to replicate three-ten-backport project. JS-Joda is broken down into a core project (what tick depends on) and additional timezone and locale projects.

The js-joda timezone dependency contains the timezone database, containing mappings between zone names, their offsets from UTC, and daylight savings(DST) data.

Locale data is needed for custom date formatters which need particular symbols, such as M for month. Due to the size and complexity of using the js-joda-locale, the authors of js-joda-locale have created prebuilt locale packages, for specific locales. en-US is one which is currently packaged for cljs and can be used as suggested above. The henryw374.js-joda-locale-en-us package is not yet available on cljsjs because the underlying package is not yet on npm see for more info.

OffsetTime is currently missing from JS-Joda (see JS-Joda issue 240). For now, tick uses LocalTime as the implementation which is not ideal.

OffsetDateTime is also missing but ZonedDateTime has the same functionality so this shouldn’t be a problem.