A Clojure(Script) & babashka library for dealing with time. Intended as a replacement for clj-time.
Based on Java 8 time (on the JVM) and js-joda (on JavaScript runtimes). Javascript’s modern date-time API Temporal is a consideration as an alternative foundation for tick in future. See the Tempo library if interested.
See Henry Widd’s talk at Clojure/North 2019 for some background
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tick.core - stable
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tick.alpha.interval - Alpha: Ready to use with the caveat that the API might still undergo minor changes. Note also that this part of tick is not being actively maintained at the moment (other than to keep existing tests passing). There are currently around 4 open tickets relating to intervals which no one is looking at. It may be maintained again in the future of course.
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If you are just working on the JVM and are comfortable with the
java.timeAPI then raw interop will work just fine. -
If you are working in a Javascript environment then seriously consider using cljc.java-time: Its build size will not adversely affect your users (unless in a highly constrained context such as a microcontroller). The reason is the native Date API is flawed
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If you meet any of the following criteria, use cljc.java-time:
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are creating cross-platform date-time logic
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are not proficient in java.time and would like improved error messages
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would rather not maintain type hints in your code
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If you meet the criteria to use cljc.java-time but would like a more terse API and the benefits of e.g. (t/with-clock …) but will not miss having every date-time recipe one google search away, then tick might be a good choice. Tick uses cljc.java-time so you can always drop to that if Tick is missing something you need.
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Similar in aiming for a terse API, but jvm-only is clojure.java-time.
(require '[tick.core :as t])
;; Get the current time
(t/instant)In both Clojure and Clojurescript versions, tick is just calling through to java.time methods. Understanding the main entities of java.time is necessary to use tick. For example, one should know that there are 2 separate ways to measure amounts of time (Period and Duration), 3 ways to represent a point on the timeline (Instant, ZonedDateTime & OffsetDateTime) and so on.
Instants are not 'calendar-aware' - they just contain millis+nanos fields representing an offset from the Unix epoch. This means Instants have no method to get their year or month for example, because to do so would require a calendar (e.g. the Gregorian calendar).
However, the following does work in Tick:
(t/year (t/instant)). To make that possible, tick first converts the Instant into a ZonedDateTime
(which does have a calendar). Take note however that the zone of the ZonedDateTime will be the
browser’s or jvm’s timezone. To be explicit about the zone required do this:
(-> (t/instant)
(t/in "UTC")
(t/year))The other cases where calendar-awareness might come up is when formatting Instants to string or when shifting them by e.g. years/months, so Tick shows explanatory error messages in that case.
Get the latest from Clojars and
add to your project.clj, build.boot or deps.edn.
To use this from Clojurescript, you must have at least version 1.11.51. If using shadow-cljs, it must be at least version 2.19.3
If using cljsjs, add js-joda and js-joda-locale-en-us and js-joda-timezone to your dependencies as well.
For Clojurescript users of Tick, see docs/cljs.adoc, for some discussion around Clojurescript build size.
Here is a one-liner to drop into a node repl with tick:
clj -Sdeps '{:deps {org.clojure/clojurescript {:mvn/version "RELEASE" } tick/tick {:mvn/version "RELEASE"} henryw374/js-joda {:mvn/version "RELEASE"} }}' -m cljs.main -re node --repl
Here is how to get to a babashka (v 1.2.174+) repl with tick:
export BABASHKA_CLASSPATH=$(clojure -Spath -Sdeps '{:deps {tick/tick {:mvn/version "0.6.0"}}}')
bb
Build the html
make
make dev-docs-cljs to build the js for the site needs fixing.
The following is not working currently:
make release-docs-cljs
clj -Atest-clj:test-cljs
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To start testing clojurescript, follow instructions in the
cljsns. -
To start testing clojure, follow instructions in the the
replns.
See the .github dir to see instructions for CLI testing
create a git tag.
make install (this installs in ~/.m2 - check that things look ok)
make deploy - you need to have set up clojars credentials as per https://github.com/applied-science/deps-library
git push origin new-tag-name
In particular, special credit to Eric Evans for discovering Allen’s interval algebra and pointing out its potential usefulness, demonstrating a working implementation of Allen’s ideas in his Clojure library.
Thanks also to my esteemed colleagues Patrik Kårlin for his redesign of the interval constructor function, and Henry Widd for porting to cljc.
The MIT License (MIT)
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