moment vs dayjs
JavaScript Date Manipulation Libraries
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JavaScript Date Manipulation Libraries

Date manipulation libraries are essential tools in JavaScript development, providing developers with the ability to parse, validate, manipulate, and display dates and times in a more manageable way than using native JavaScript Date objects alone. These libraries facilitate operations such as formatting dates, calculating differences between dates, and handling time zones, which can be complex and error-prone when done manually. Both Day.js and Moment.js serve similar purposes but differ significantly in design philosophy, performance, and size, making them suitable for different use cases in web development.

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moment0-4.5 MB-6 days agoMIT
dayjs048,666682 kB1,334a month agoMIT

Feature Comparison: moment vs dayjs

Size and Performance

  • moment:

    Moment.js is larger (around 16KB minified and gzipped), which can impact performance, especially in applications where bundle size is a concern. While it offers extensive functionality, the trade-off is a larger footprint that may not be suitable for all projects.

  • dayjs:

    Day.js is significantly smaller in size (about 2KB minified and gzipped), making it a great choice for performance-sensitive applications. Its lightweight nature means faster load times and lower bandwidth usage, which is crucial for mobile applications and sites with many users.

API Design

  • moment:

    Moment.js provides a rich API with a wide range of features, including parsing, formatting, and manipulating dates. However, its API can be considered more complex due to the extensive options available, which may lead to a steeper learning curve for new users.

  • dayjs:

    Day.js has a modern and intuitive API that is designed to be chainable and easy to use. It mimics the Moment.js API, making it easy for developers familiar with Moment.js to transition. Its simplicity allows for quick date manipulations without much overhead.

Mutability

  • moment:

    Moment.js is mutable, allowing for in-place modifications of date objects. While this can be convenient, it can also lead to unintended side effects if not managed carefully, especially in larger applications where state management is critical.

  • dayjs:

    Day.js is immutable, meaning that any operations performed on a Day.js object return a new instance rather than modifying the original object. This immutability helps prevent side effects and makes the code easier to reason about, especially in functional programming contexts.

Localization and Time Zones

  • moment:

    Moment.js has built-in support for localization and time zones, making it a robust choice for applications that require extensive internationalization features. Its comprehensive handling of time zones and formats makes it suitable for applications with complex date and time requirements.

  • dayjs:

    Day.js supports localization through plugins, allowing developers to add only the locales they need, which keeps the bundle size small. However, its time zone support is limited compared to Moment.js, requiring additional plugins for full functionality.

Community and Maintenance

  • moment:

    Moment.js has a large and established community, but it is in maintenance mode, meaning that no new features are being added, and the focus is primarily on fixing bugs. This may be a consideration for long-term projects that require ongoing support and updates.

  • dayjs:

    Day.js has a growing community and is actively maintained, with a focus on performance and simplicity. Its modern approach and smaller size have attracted a lot of attention, making it a popular choice for new projects.

How to Choose: moment vs dayjs

  • moment:

    Moment.js is a legacy project, now in maintenance mode. In most cases, you should choose a different library.

  • dayjs:

    Choose Day.js if you need a lightweight library with a modern API that is easy to use and integrates well with existing projects. It is ideal for applications where performance and bundle size are critical, and it offers a similar API to Moment.js, making it easy to switch.

Similar Npm Packages to moment

moment is a widely-used JavaScript library for parsing, validating, manipulating, and formatting dates and times. It provides a simple and intuitive API that allows developers to work with dates in a way that is both powerful and easy to understand. However, as applications have evolved, some developers have sought alternatives to moment due to its large size and performance considerations. Here are a few popular alternatives:

  • date-fns is a modern JavaScript date utility library that provides a comprehensive set of functions for manipulating dates. Unlike moment, which is a monolithic library, date-fns is modular, allowing developers to import only the functions they need. This modularity results in smaller bundle sizes and improved performance. date-fns is a great choice for developers looking for a lightweight and functional approach to date manipulation without sacrificing functionality.

  • dayjs is a minimalist JavaScript library that offers a similar API to moment but with a much smaller footprint. It is designed to be a drop-in replacement for moment, making it easy for developers to transition without having to learn a new API. dayjs is particularly useful for projects where performance and bundle size are critical, as it provides many of the same features as moment while being significantly lighter.

  • luxon is a powerful library for working with dates and times in JavaScript, created by one of the Moment.js maintainers. It offers a rich set of features, including support for time zones, localization, and formatting. luxon is built on the modern JavaScript Date API and provides a more robust solution for applications that require advanced date and time manipulation. If your project needs to handle complex date scenarios, such as time zone conversions or internationalization, luxon is an excellent choice.

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

Similar Npm Packages to dayjs

dayjs is a lightweight JavaScript library for parsing, validating, manipulating, and displaying dates and times. It is designed to be a modern alternative to Moment.js, offering a similar API but with a much smaller footprint. Day.js is particularly useful for developers looking for a simple and efficient way to handle date and time operations without the overhead of larger libraries. Its immutable nature and extensive plugin system make it versatile for various date-related tasks.

While Day.js is a great choice for date manipulation, there are several alternatives in the JavaScript ecosystem that also provide robust date handling capabilities. Here are a few notable options:

  • js-joda is a date and time library inspired by the Java 8 Date and Time API. It provides a comprehensive set of features for handling dates, times, and durations in a type-safe manner. Js-joda is particularly beneficial for applications that require precise date and time calculations, as it avoids the pitfalls of JavaScript's native Date object. If you are looking for a library that emphasizes immutability and a clear API, js-joda is an excellent choice.

  • luxon is a powerful library for working with dates and times in JavaScript. Created by one of the Moment.js developers, Luxon provides a rich set of features, including time zone support, localization, and formatting. It is built on the modern JavaScript Date API and offers a more intuitive API for developers. If your application requires advanced date and time manipulation, especially with time zones, Luxon is a strong contender.

  • moment is one of the most popular date manipulation libraries in the JavaScript ecosystem. It provides a comprehensive set of features for parsing, validating, and formatting dates and times. However, Moment.js has a larger footprint compared to newer libraries like Day.js and Luxon. While it is still widely used, developers are encouraged to consider lighter alternatives for new projects.

To see how Day.js compares with js-joda, Luxon, and Moment, check out the comparison: Comparing dayjs vs js-joda vs luxon vs moment.

README for moment

Moment.js

NPM version NPM downloads MIT License Coverage Status FOSSA Status

A JavaScript date library for parsing, validating, manipulating, and formatting dates.

⚠️ Moment.js is a legacy project, now in maintenance mode. New features are not being accepted. For more details, see the latest project status update.

Thank you.

Moment.js is a project of the OpenJS Foundation, which is part of the Linux Foundation.

Resources

Installation

Install Moment.js using a package manager like npm, yarn, or bun.

npm install moment

License

Moment.js is an OpenJS Foundation project and is freely distributable under the terms of the MIT license.

OpenJS Foundation

Copyright OpenJS Foundation and Moment.js contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

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