js-joda vs date-fns
JavaScript Date Manipulation Libraries
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JavaScript Date Manipulation Libraries

Date manipulation libraries are essential tools in web development that help developers manage, format, and manipulate dates and times effectively. They provide a range of functionalities such as parsing, formatting, comparing, and performing arithmetic operations on dates. Using these libraries can significantly simplify the complexities associated with JavaScript's native Date object, which can be cumbersome and error-prone. The choice between libraries like date-fns and js-joda often depends on the specific needs of a project, such as performance, ease of use, and the desired level of functionality.

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js-joda38,0911,656-157 years agoBSD-3-Clause
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Feature Comparison: js-joda vs date-fns

Modularity

  • js-joda:

    js-joda is a monolithic library, meaning it includes all functionalities in a single package. While this can lead to larger bundle sizes, it provides a comprehensive set of features out of the box, which can be advantageous for applications requiring extensive date manipulation.

  • date-fns:

    date-fns is designed with a modular architecture, allowing developers to import only the specific functions they need. This results in smaller bundle sizes and improved performance, making it a great choice for projects where minimizing load time is crucial.

Immutability

  • js-joda:

    js-joda emphasizes immutability, meaning that any operations on date and time objects return new instances rather than modifying the original. This approach helps prevent side effects and makes the library safer to use in complex applications.

  • date-fns:

    date-fns operates on mutable Date objects, meaning that the original date can be altered. This can lead to unintended side effects if not managed carefully, especially in larger applications where state management is critical.

Time Zone Support

  • js-joda:

    js-joda provides extensive support for time zones, allowing developers to handle complex date and time scenarios with ease. It adheres to the ISO-8601 standard, making it suitable for applications that require precise time zone calculations.

  • date-fns:

    date-fns has limited support for time zones, primarily relying on the native Date object. For applications that require robust time zone handling, additional libraries may be necessary to complement its functionality.

Localization

  • js-joda:

    js-joda also supports localization, but its focus is more on adhering to the ISO-8601 standard. While it can handle localized formatting, it may require additional configuration compared to date-fns.

  • date-fns:

    date-fns offers built-in localization support, allowing developers to format dates according to various locales. This feature is particularly useful for applications targeting international audiences, ensuring that date formats are culturally appropriate.

Learning Curve

  • js-joda:

    js-joda has a steeper learning curve due to its comprehensive feature set and adherence to the ISO-8601 standard. Developers may need to invest more time to understand its concepts, especially if they are not familiar with immutable data structures.

  • date-fns:

    date-fns has a relatively gentle learning curve, especially for developers familiar with JavaScript's native Date object. Its straightforward API and modular approach make it easy to pick up and integrate into projects quickly.

How to Choose: js-joda vs date-fns

  • js-joda:

    Choose js-joda if you need a comprehensive and robust date and time library that adheres to the ISO-8601 standard. It is particularly useful for applications that require complex date and time calculations, time zones, and immutability.

  • date-fns:

    Choose date-fns if you prefer a lightweight, modular library that allows you to import only the functions you need, which can help reduce bundle size. It's ideal for projects that require straightforward date manipulation without the overhead of a full-fledged date library.

Similar Npm Packages to js-joda

js-joda is a modern JavaScript date and time library that provides a comprehensive API for working with dates and times in a way that is both intuitive and immutable. Inspired by the Java 8 Date and Time API, js-joda allows developers to handle date and time calculations, formatting, and parsing with ease. It is particularly useful for applications that require precise date and time operations, such as scheduling, time zone management, and complex date manipulations. With its focus on immutability and clear API design, js-joda helps prevent common pitfalls associated with date and time handling in JavaScript.

While js-joda offers a robust solution for date and time management, there are alternatives available that cater to different needs. One notable alternative is date-fns.

  • date-fns is a lightweight and modular date utility library that provides a comprehensive set of functions for manipulating and formatting dates in JavaScript. Unlike js-joda, which focuses on an immutable object-oriented approach, date-fns offers a functional programming style, allowing developers to import only the functions they need. This modular design helps keep bundle sizes small and improves performance. Date-fns is ideal for projects that require a simple and flexible solution for date manipulation without the overhead of a larger library.

To see how js-joda compares with date-fns, check out the comparison: Comparing js-joda vs date-fns.

Similar Npm Packages to date-fns

date-fns is a popular JavaScript library for manipulating and formatting dates. It provides a comprehensive set of functions that allow developers to work with dates in a functional programming style. With its modular approach, you can import only the functions you need, making it lightweight and efficient. date-fns is known for its simplicity and ease of use, making it a great choice for both small and large projects.

While date-fns is a powerful option for date manipulation, there are several alternatives in the JavaScript ecosystem that also provide date handling capabilities. Here are a few notable alternatives:

  • datejs is a JavaScript library that provides a comprehensive set of date manipulation functions. It offers a simple and intuitive API for parsing, formatting, and manipulating dates. datejs is particularly useful for developers who need to work with various date formats and perform complex date calculations. However, it may not be as lightweight as some other libraries, making it more suitable for projects where extensive date manipulation is required.

  • dayjs is a minimalist JavaScript library that offers a simple and fast alternative to Moment.js. It has a similar API to Moment.js, making it easy to switch for those familiar with it. dayjs is designed to be small in size and provides a wide range of date manipulation functions. If you're looking for a lightweight library with a familiar API, dayjs is an excellent choice.

  • luxon is a powerful library for working with dates and times in JavaScript. It is built on the modern JavaScript Date API and provides a rich set of features for date manipulation, formatting, and time zone handling. luxon is particularly useful for applications that require robust time zone support and internationalization. If your project involves complex date and time requirements, luxon is a strong contender.

  • moment is one of the most well-known date manipulation libraries in the JavaScript ecosystem. It provides a comprehensive set of features for parsing, validating, manipulating, and formatting dates. However, it has become less favored in recent years due to its larger size and performance concerns compared to newer libraries. While moment is still widely used, developers are increasingly turning to lighter alternatives like date-fns and dayjs.

To see how date-fns compares with datejs, dayjs, luxon, and moment, check out the comparison: Comparing date-fns vs datejs vs dayjs vs luxon vs moment.

README for js-joda

Immutable date and time library for JavaScript

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Introduction

js-joda is an immutable date and time library for JavaScript. It provides a simple, domain-driven and clean API based on the ISO8601 calendar.

  • js-joda has a lightweight footprint, only 43 kB minified and compressed, no third party dependencies.

  • js-joda is fast. It is about 2 to 10 times faster than other JavaScript date libraries.

  • js-joda supports ECMAScript 5 browsers down to IE9.

  • 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.

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 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 LocalDate, ZonedDateTime or Period. For example, LocalDate allows 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'.

Getting started

Node

Install joda using npm

npm install js-joda

Then require it to any module

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

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

Browser

To use js-joda from a browser, download either dist/js-joda.min.js or 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>

Documentation

Roadmap

Milestone 1: Core domains (reached with version v1.0.0)

  • Support for the domain models LocalDate, LocalDateTime, ZonedDateTime, Instant, Duration and Period converting 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 ZonedDateTime.
  • 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

Future Milestones

  • Reduce library size by removing redundant code, especially by refactoring code for formatting/ parsing dates.
  • Increase test coverage (ongoing task)
  • Cleanup documentation (ongoing task)
  • Improve static factory API design and make it more JavaScript style. One idea is to remove static factory methods like parse, from, of and unify it to one factory method per domain. E.g. localDate(isoDate: string), localDate(year: number, month: number, dayOfMonth: number)
  • Merge methods get and getLong (difference between int and long values makes no sense with JavaScript)
  • Simplify temporal adjusters (amount, etc) by using functions instead of classes or objects

Contributing

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.

License

js-joda uses the ThreeTen-Backport implementation (http://www.threeten.org/threetenbp/) as a reference base for implementation. This allows us to release js-joda under the BSD License while the OpenJDK java.time implementation is under GNU GPL+linking exception. The API of the ThreeTen-Backport is mostly identical to the official Java SE 8 API from the view of our JavaScript port.

  • js-joda is 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

  • 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.

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