Immutable data and time library for javascript

Introduction

JS-Joda-Time is a project that wants to bring joda time library to the javascript world. The Project is in a very early state. Be aware that the most of the things written here are not ready yet

JS-Joda-Time, a port of the Joda-Time immutable data and time library to javascript. It provides a simple and clean API based on the ISO8601 calendar. Joda-Time is the de facto standard date and time library for Java. From Java SE 8 it is part of the jdk at java.time (JSR-310).

Why yet another javascript date and time library

• Popular javascript date libraries like moment or date-utils are wrappers around the native javascript Date object, providing syntactic sugar. The native Date object always consist of a date, time and a timezone part.

• In opposite to that, JS-Joda-Time is a standalone date and time implementation. It brings concepts like a LocalDate that allows to handle dates like birthdays or holidays in a clean and error-safe way, especially if this dates are persisted to an external server.

• JS-Joda-Time is immutable. Immutability aligns well with pure functions and with the architecture of frameworks like React and Flux.

• JS-Joda-Time is a port of the sophisticated, robust and domain-driven API of Joda-Time (to be more precise of the jdk8 java.time package).

Getting started

The library is in a very early state, far away from productive. But you are very welcome to play around with JS-Joda-Time and to give your feedback. Please check the tests and the API Documentation for the current state of development.

Node

Install joda using npm

npm install js-joda-time

Then require it to any module

var LocalDate = require('js-joda-time').LocalDate;

var d = LocalDate.parse('2012-12-24').atStartOfDay().plusMonths(2); // 2013-02-24T00:00:00

Browser

To use JS-Joda-Time from a browser, download either dist/jsJodaTime.min.js or dist/jsJodaTime.js (with sourcemaps for development)

Then add it as a script tag to your page

<script src="jsJodaTime.min.js"></script>
<script>
    var LocalDate = jsJodaTime.LocalDate;
    var d = LocalDate.parse('2012-12-24').atStartOfDay().plusMonths(2); // 2013-02-24T00:00:00
</script>

Documentation

• Cheat Sheet Quick start guide
• API ESDoc generated API documentation hosted by the ESDoc Hosting Service
• JS-Joda-Time Homepage Project homepage

License

• The License model is still under consideration, but it will be an open source license.

• Joda-Time is under Apache 2.0 licence.

• OpenJdk is under GNU GPL+linking exception.

• The author of joda time and the lead architect of the JSR-310 is Stephen Colebourne. The API of this project (as far as possible with javascript), a lot of implementation details and documentation are just copied but never equalled ;)