date-fns vs dayjs vs luxon vs moment-timezone

Managing Date and Time in Modern JavaScript Applications

date-fns, dayjs, luxon, and moment-timezone are JavaScript libraries designed to handle date parsing, formatting, manipulation, and timezone conversion. date-fns offers a functional approach with immutable operations using native Date objects. dayjs provides a lightweight, chainable API similar to Moment.js but with immutability. luxon focuses on correctness and timezone support using the Intl API with class-based structures. moment-timezone extends Moment.js to handle timezones but relies on a legacy architecture that is no longer recommended for new development.

Npm Package Weekly Downloads Trend

3 Years

Github Stars Ranking

Stat Detail

Package	Downloads	Stars	Size	Issues	Publish	License
Package	Downloads	Stars	Size	Issues	Publish	License
date-fns	0	-	10.9 MB	-	3 months ago	MIT
dayjs	0	48,665	682 kB	1,324	25 days ago	MIT
luxon	0	16,457	4.59 MB	181	a year ago	MIT
moment-timezone	0	3,879	2.81 MB	68	2 months ago	MIT

Date Libraries: date-fns vs dayjs vs luxon vs moment-timezone

Handling dates in JavaScript is notoriously difficult due to inconsistent native APIs and timezone complexities. date-fns, dayjs, luxon, and moment-timezone all solve these problems, but they take very different approaches to architecture, mutability, and maintenance. Let's compare how they handle real-world engineering tasks.

🛡️ Mutability and Data Safety

Data safety is critical when manipulating time values. Changing a date object unexpectedly can cause hard-to-track bugs in state management.

date-fns treats dates as immutable values. Every function returns a new Date object.

import { addDays } from 'date-fns';

const today = new Date();
const tomorrow = addDays(today, 1);

console.log(today !== tomorrow); // true

dayjs is also immutable. Chaining methods returns new instances rather than modifying the original.

import dayjs from 'dayjs';

const today = dayjs();
const tomorrow = today.add(1, 'day');

console.log(today.isSame(tomorrow)); // false

luxon uses immutable classes. Methods like plus return a new DateTime instance.

import { DateTime } from 'luxon';

const today = DateTime.now();
const tomorrow = today.plus({ days: 1 });

console.log(today.equals(tomorrow)); // false

moment-timezone is mutable by default. Methods modify the original object, which can lead to side effects.

import moment from 'moment-timezone';

const today = moment();
const tomorrow = today.clone().add(1, 'day'); // Must clone to avoid mutation

console.log(today.isSame(tomorrow)); // false

🌍 Timezone Handling

Timezone support varies from built-in classes to external plugins. This affects bundle size and reliability.

date-fns relies on native Date objects. Timezone support requires date-fns-tz as a separate package.

import { zonedTimeToFormat } from 'date-fns-tz';

const date = new Date();
const formatted = zonedTimeToFormat(date, 'yyyy-MM-dd HH:mm:ss', { timeZone: 'America/New_York' });

dayjs requires the timezone plugin to handle timezones explicitly.

import dayjs from 'dayjs';
import utc from 'dayjs/plugin/utc';
import timezone from 'dayjs/plugin/timezone';

dayjs.extend(utc);
dayjs.extend(timezone);

const formatted = dayjs().tz('America/New_York').format('YYYY-MM-DD HH:mm:ss');

luxon has timezone support built into the core using the Intl API.

import { DateTime } from 'luxon';

const formatted = DateTime.now().setZone('America/New_York').toFormat('yyyy-MM-dd HH:mm:ss');

moment-timezone includes timezone data within the package. It uses its own database rather than Intl.

import moment from 'moment-timezone';

const formatted = moment().tz('America/New_York').format('YYYY-MM-DD HH:mm:ss');

🧩 API Style and Learning Curve

The way you write code differs significantly between functional, chainable, and class-based styles.

date-fns uses standalone functions. This encourages tree-shaking and clear data flow.

import { format, addMonths } from 'date-fns';

const date = addMonths(new Date(), 1);
const result = format(date, 'yyyy-MM-dd');

dayjs uses a chainable object API. This feels familiar to developers coming from jQuery or Moment.

import dayjs from 'dayjs';

const result = dayjs().add(1, 'month').format('YYYY-MM-DD');

luxon uses class methods with named arguments. This improves readability for complex operations.

import { DateTime } from 'luxon';

const result = DateTime.now().plus({ months: 1 }).toFormat('yyyy-MM-dd');

moment-timezone uses a chainable object API similar to Day.js but with mutable state.

import moment from 'moment-timezone';

const result = moment().add(1, 'month').format('YYYY-MM-DD');

⚠️ Maintenance and Future Proofing

Library maintenance status is a critical architectural decision. Using a deprecated library introduces security and compatibility risks.

moment-timezone is part of the Moment.js ecosystem, which is officially in maintenance mode. The team recommends migrating to modern alternatives. It does not support modern ESM workflows well and relies on older JavaScript patterns.

date-fns, dayjs, and luxon are actively maintained. They support modern module systems and receive regular updates for bug fixes and timezone database changes.

📊 Summary Table

Feature	`date-fns`	`dayjs`	`luxon`	`moment-timezone`
Mutability	✅ Immutable	✅ Immutable	✅ Immutable	❌ Mutable
Timezone	📦 Separate Package	🔌 Plugin Required	✅ Built-in (Intl)	✅ Built-in (Legacy)
API Style	🛠️ Functional	🔗 Chainable	🏛️ Class-based	🔗 Chainable
Bundle Strategy	🌳 Tree-shakable	🧩 Core + Plugins	📦 Class Imports	🗄️ Monolithic
Status	✅ Active	✅ Active	✅ Active	⚠️ Legacy

💡 The Big Picture

date-fns is like a utility belt 🛠️ — perfect for developers who want pure functions and maximum tree-shaking. It keeps your code predictable and works well with native Date objects.

dayjs is like a lightweight replacement 🪶 — ideal for teams migrating from Moment who want the same API style without the baggage. It balances ease of use with performance.

luxon is like a precision instrument 🕰️ — best for applications where timezone correctness and duration math are critical. It leverages modern browser APIs for better accuracy.

moment-timezone is like an old engine 🏚️ — it still runs, but parts are no longer made. Do not use it for new projects. Only keep it if you are maintaining legacy systems that cannot be refactored yet.

Final Thought: For new development, avoid moment-timezone. Choose luxon for complex timezone needs, date-fns for functional purity, or dayjs for API familiarity. All three modern options will serve your architecture better than legacy tools.

How to Choose: date-fns vs dayjs vs luxon vs moment-timezone

date-fns:
Choose date-fns if you prefer a functional programming style and want to avoid extending native prototypes. It is ideal for projects that need tree-shaking support and rely heavily on native Date objects without extra class wrappers.
dayjs:
Choose dayjs if you want a Moment-like chainable API but need a smaller footprint and immutable data. It works well for teams migrating from Moment who want minimal code changes while improving performance.
luxon:
Choose luxon if timezone accuracy and Intl API integration are your top priorities. It is suitable for complex applications requiring robust duration handling and immutable class-based data structures.
moment-timezone:
Do NOT choose moment-timezone for new projects. It is in maintenance mode and considered legacy. Only use it if you are maintaining an existing codebase that cannot be refactored immediately.

Popular Comparisons

date-fns

dayjs

luxon

moment-timezone

README for date-fns

🔥️ NEW: date-fns v4.0 with first-class time zone support is out!

date-fns provides the most comprehensive, yet simple and consistent toolset for manipulating JavaScript dates in a browser & Node.js

👉 Documentation

👉 Blog

It's like Lodash for dates

It has 200+ functions for all occasions.
Modular: Pick what you need. Works with webpack, Browserify, or Rollup and also supports tree-shaking.
Native dates: Uses existing native type. It doesn't extend core objects for safety's sake.
Immutable & Pure: Built using pure functions and always returns a new date instance.
TypeScript: The library is 100% TypeScript with brand-new handcrafted types.
I18n: Dozens of locales. Include only what you need.
and many more benefits

import { compareAsc, format } from "date-fns";

format(new Date(2014, 1, 11), "yyyy-MM-dd");
//=> '2014-02-11'

const dates = [
  new Date(1995, 6, 2),
  new Date(1987, 1, 11),
  new Date(1989, 6, 10),
];
dates.sort(compareAsc);
//=> [
//   Wed Feb 11 1987 00:00:00,
//   Mon Jul 10 1989 00:00:00,
//   Sun Jul 02 1995 00:00:00
// ]

The library is available as an npm package. To install the package run:

npm install date-fns --save

Docs

See date-fns.org for more details, API, and other docs.