Why look beyond Moment.js

Moment.js has been a foundational library for date and time manipulation in JavaScript applications since its inception in 2011. It provided a comprehensive API for parsing, formatting, and performing calculations with dates, addressing many shortcomings of native JavaScript Date objects. However, the project announced in 2020 that it would enter a maintenance-only mode, ceasing active feature development. This decision was driven by several factors, including its mutable API design, which can lead to unexpected side effects, and its relatively large bundle size compared to modern alternatives. The maintainers specifically recommend that new projects avoid Moment.js and instead adopt newer libraries that offer immutable APIs, smaller footprints, and better tree-shaking capabilities, aligning with current JavaScript development practices.

For existing projects, migrating away from Moment.js might be considered for performance improvements, reduced bundle sizes, or to adopt a more modern, immutable date handling paradigm. While Moment.js remains functional for legacy applications, the lack of new features and potential for unaddressed edge cases makes exploring alternatives a prudent step for long-term project health and maintainability.

Top alternatives ranked

  1. 1. Luxon — A modern, immutable, and powerful date library

    Luxon is a date and time library that aims to provide a more robust and developer-friendly experience than Moment.js. Developed by one of the original Moment.js contributors, Luxon is built on the native Intl object, offering superior internationalization support without external dependencies. Its core design principle is immutability, meaning all operations return new Luxon instances instead of modifying the original, which helps prevent common bugs related to date manipulation. Luxon provides a rich API for parsing, formatting, and manipulating dates, supporting timezones, durations, and intervals. It emphasizes clarity and explicitness in its API, making it a strong choice for applications requiring precise date and time handling, especially those with global audiences. Luxon's approach to date handling is aligned with modern JavaScript practices, making it a suitable replacement for Moment.js in new projects and a strong candidate for migrations.

    Best for: Applications requiring robust internationalization, immutable date objects, and precise timezone handling.

    Learn more about Luxon

    Visit the official Luxon website

  2. 2. date-fns — Modular JavaScript date utility library

    date-fns is a comprehensive collection of JavaScript functions for manipulating dates. Unlike monolithic libraries, date-fns is designed to be fully modular, allowing developers to import only the specific functions they need. This modularity leads to significantly smaller bundle sizes, as unused code can be tree-shaken by modern bundlers. Each function is a pure function, meaning it doesn't modify the original date object but instead returns a new one, promoting an immutable approach to date handling. date-fns also provides excellent internationalization support, with many locales available. Its API is built to be a consistent and predictable set of functions, making it easy to learn and integrate into existing projects. The library is well-documented and actively maintained, with a large community providing support and contributions. Its focus on small, independent functions makes it highly flexible and suitable for projects prioritizing bundle size and functional programming paradigms.

    Best for: Projects prioritizing minimal bundle sizes, functional programming, and easy tree-shaking.

    Learn more about date-fns

    Visit the official date-fns website

  3. 3. Day.js — A minimalist 2KB immutable date library compatible with Moment.js API

    Day.js is a minimalist JavaScript library that parses, validates, manipulates, and displays dates and times. It is designed to be a lightweight alternative to Moment.js, with a similar API that makes migration straightforward for developers familiar with Moment.js. Day.js clocks in at a tiny 2KB (minified and gzipped), making it an excellent choice for performance-sensitive applications where every kilobyte counts. Like Luxon and date-fns, Day.js embraces immutability, ensuring that date operations return new instances and avoid side effects. It supports internationalization through a plugin system, allowing developers to load only the locales they need. While its core functionality is lean, a rich ecosystem of plugins extends its capabilities to cover advanced use cases like timezone support. Day.js offers a compelling balance of familiar API, small size, and modern design principles, making it a strong contender for projects looking to replace Moment.js with minimal refactoring.

    Best for: Projects seeking a lightweight Moment.js replacement with a familiar API and easy migration.

    Learn more about Day.js

    Visit the official Day.js website

  4. 4. Native Date and Intl API — Browser-native date handling

    For many common date and time operations, modern JavaScript's native Date object combined with the Intl API can be a sufficient and performant solution, eliminating the need for external libraries entirely. The Date object provides fundamental capabilities for creating, getting, and setting date and time components. The Intl object, specifically Intl.DateTimeFormat, offers robust internationalization features, including formatting dates and times according to locale-specific conventions, timezones, and various formatting styles. This combination is particularly effective for simple display formatting or basic date calculations that do not require complex manipulation or advanced timezone logic. Leveraging native browser APIs reduces bundle size to zero, improves load times, and avoids potential compatibility issues with third-party libraries. While it may require more verbose code for complex scenarios compared to a dedicated library, its native performance and zero-dependency nature make it an attractive option for projects with minimal date handling requirements.

    Best for: Projects with basic date formatting and manipulation needs, prioritizing zero dependencies and minimal bundle size.

    Learn more about the native Date object

    Learn more about the Intl.DateTimeFormat API

  5. 5. js-Joda — Immutable date and time for JavaScript, inspired by Java 8's Joda-Time

    js-Joda is an immutable date and time library for JavaScript, heavily inspired by the Java 8 Date and Time API (JSR-310) and Joda-Time. It provides a comprehensive and robust API for handling dates, times, durations, and timezones with a strong emphasis on correctness and clarity. Unlike Moment.js, js-Joda strictly separates date, time, and timezone concepts, leading to a more explicit and less error-prone API. It offers advanced features such as period and duration calculations, precise timezone handling, and support for various calendar systems. While it might have a steeper learning curve for developers unfamiliar with its conceptual model, js-Joda's rigorous design makes it ideal for enterprise-level applications or systems where date and time accuracy is critical. Its immutable nature ensures predictable behavior, and its modular design allows for tree-shaking, although its overall footprint might be larger than minimalist libraries like Day.js.

    Best for: Enterprise applications requiring precise, immutable, and complex date/time calculations with strong timezone support.

    Visit the official js-Joda website

Side-by-side

Feature Moment.js Luxon date-fns Day.js Native Date/Intl js-Joda
Bundle Size (gzipped) ~70KB ~20KB Modular (small per function) ~2KB 0KB ~15KB
Immutability Mutable Immutable Immutable Immutable Mutable (Date) Immutable
Active Development Maintenance-only Active Active Active N/A (browser native) Active
Moment.js API Compatibility N/A Low Low High None None
Internationalization Bundled locales Built-in (Intl) Modular locales Plugin-based Built-in (Intl) Built-in
Timezone Support Plugin (Moment-timezone) Built-in External library required Plugin-based Built-in (limited) Built-in, robust
Tree-shaking Friendly No Yes Yes Yes N/A Yes
Learning Curve Low Medium Medium Low Medium High

How to pick

Choosing the right date and time library depends on your project's specific needs, performance requirements, and developer familiarity. Consider the following factors when making your decision:

  • For new projects prioritizing modern practices: If you are starting a new project and want to adopt an immutable API with robust internationalization, Luxon is an excellent choice. It offers a comprehensive feature set and leverages native browser APIs for performance. Its explicit API design helps prevent common date-related bugs.
  • For minimal bundle size and modularity: When bundle size is a critical concern, and you prefer a functional programming approach, date-fns stands out. Its modular design ensures you only include the functions you use, leading to highly optimized builds. It's ideal for front-end applications where every kilobyte matters.
  • For easy migration from Moment.js: If you're transitioning an existing project from Moment.js and want to minimize refactoring effort, Day.js is the top recommendation. Its API is highly compatible with Moment.js, allowing for a relatively smooth switch, while also providing the benefits of a smaller bundle size and immutability.
  • For basic date needs and zero dependencies: For projects with very simple date formatting or calculations where adding a library seems overkill, leveraging the native Date object and Intl API is the most efficient solution. This approach ensures the smallest possible footprint and relies on browser-native performance.
  • For complex enterprise-grade date/time logic: When your application demands high precision, complex temporal calculations, and strict separation of date, time, and timezone concepts, js-Joda is a powerful contender. Its design, inspired by mature Java APIs, offers a robust framework for handling intricate date and time scenarios, although it comes with a steeper learning curve.
  • Consider future maintenance: Since Moment.js is no longer actively developed, choosing an actively maintained library ensures you receive ongoing updates, bug fixes, and new features. All listed alternatives (except native APIs) are under active development, providing long-term support.