js-joda has a lightweight footprint, only 43 kB minified and compressed, no third party dependencies.
js-joda comes with built-in parsers/ formatters for ISO 8601 as specified in RFC 3339, that can be easily customized.
js-joda supports ECMAScript 5 browsers down to IE11.
js-joda is a port of the threeten backport, which is the base for JSR-310 implementation of the Java SE 8 java.time package. Threeten is inspired by Joda-Time, having similar concepts and the same author.
js-joda is robust and stable. We ported more then 1700 test-cases with a lots of test-permutations from the threetenbp project. We run the automated karma test-suite against Firefox, Chrome, Node and phantomjs.
Dateobject, providing syntactic sugar. The native
Dateobject always consist of a date, time and a timezone part. In contrast, js-joda is a standalone date and time implementation.
The API has a domain-driven design with classes for each of the different use cases, like
Period. For example,
LocalDateallows you to handle dates without times (like birthdays or holidays) in a clean and error-safe way, especially if these dates are persisted to an external server.
js-joda is immutable. Immutability aligns well with pure functions and with the architecture of frameworks like React and Flux.
The ThreeTen domain models
Dates and Times
LocalDate represents a date without a time and timezone in the ISO-8601 calendar system, such as 2007-12-24.
LocalTime represents a time without timezone in the ISO-8601 calendar system such as '11:55:00'.
LocalDateTime is a description of the date (LocalDate), as used for birthdays, combined with the local time (LocalTime) as seen on a wall clock.
ZonedDateTime is a date-time with a timezone in the ISO-8601 calendar system, such as 2007-12-24T16:15:30+01:00 UTC+01:00.
Instant is an instantaneous point on the time-line measured from the epoch of 1970-01-01T00:00:00Z in epoch-seconds and nanosecond-of-second.
Duration and Period
Duration is a time-based amount of time, such as '34.5 seconds'.
Period is a date-based amount of time in the ISO-8601 calendar system, such as '2 years, 3 months and 4 days'.
Additional value types
Year represents a year in the ISO-8601 calendar system, such as '2016'.
YearMonth represents a year and a month in the ISO-8601 calendar system, such as '2016-01'.
Month represents a month-of-year in the ISO-8601 calendar system, such as 'July'.
MonthDay represents a month-day in the ISO-8601 calendar system, such as '--12-03'. Could be used to represent e.g. Birthdays.
DayOfWeek represents a day-of-week in the ISO-8601 calendar system, such as 'Tuesday'.
Install joda using npm
npm install @js-joda/core
Then require it to any module
var LocalDate = require('@js-joda/core').LocalDate; var d = LocalDate.parse('2012-12-24').atStartOfDay().plusMonths(2); // 2013-02-24T00:00:00
To use js-joda from a browser, download either
dist/js-joda.js (with sourcemaps for development). Then add it as a script tag to your page
<script src="js-joda.min.js"></script> <script> var LocalDate = JSJoda.LocalDate; var d = LocalDate.parse('2012-12-24').atStartOfDay().plusMonths(2); // 2013-02-24T00:00:00 </script>
js-joda consist of four packages:
||Implementation of the ThreeTen Classes and API||/packages/core|
||Implementation of timezone calculation based on the iana Time Zone Database||/packages/timezone|
||Implementation of locale specific functionality for js-joda, especially for formatting and parsing locale specific dates||/packages/locale|
||Implementation of the ThreeTen-Extra Classes and API||/packages/extra|
The @js-joda/examples package is for testing the different build artifacts in different context, like webpack, browser node, etc.
Contributions are always welcome. Before contributing please read the code of conduct & search the issue tracker. We use GitHub issues. Your issue may have already been discussed or fixed. To contribute, fork js-joda, commit your changes, & send a pull request.
By contributing to js-joda, you agree that your contributions will be licensed under its BSD license.
Note that only pull requests and issues that match the threeten backport API will be considered. Additional requested features will be rejected.
js-jodais released under the BSD 3-clause license.
Our implementation reference base ThreeTen-Backport (http://www.threeten.org/threetenbp/) is also released under the BSD 3-clause license
OpenJDKis under GNU GPL+linking exception.
The author of
Joda-Timeand the lead architect of the JSR-310 is Stephen Colebourne.
Milestone 1: Core domains (reached with version v1.0.0)
- Support for the domain models
Periodconverting to and from ISO8601.
ZonedDateTime(without support for loading iana timezone databases) currently supports only fixed offsets like UTC or UTC+02:00 and the system default time zone.
Milestone 2: IANA timezone support (reached with version v1.2.0)
- Add IANA timezone database support to js-joda. Implement handling of daylight saving transitions, mainly in
- For access to the IANA timezone database, the plugin @js-joda/timezone is required. It provides an implementation of the ZoneRulesProvider and contains the iana timezone database.
Milestone 3: Locale support (reached with v2.0.0 of @js-joda/locale)
- Add locale support.
- Extend pattern parser/ formatter for text with locale support.
see the plugin @js-joda/locale
- Reduce library size by removing redundant code, especially by refactoring code for formatting/ parsing dates.
- Increase test coverage (ongoing task)
- Cleanup documentation (ongoing task)