iamkun/dayjs

iamkun/dayjs has 48,655 GitHub stars and 3,707 forks. GitHot measured 0 stars in 24 hours. Last checked 2026-11-06 04:58 UTC. Last push 2026-09-15.

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⏰ Day.js est une bibliothèque immuable de date et d’heure de 2 kB, alternative à Moment.js et dotée de la même API moderne.

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README.md

Original

Fast 2kB alternative to Moment.js with the same modern API

Day.js is a minimalist JavaScript library that parses, validates, manipulates, and displays dates and times for modern browsers with a largely Moment.js-compatible API. If you use Moment.js, you already know how to use Day.js.

dayjs().startOf('month').add(1, 'day').set('year', 2018).format('YYYY-MM-DD HH:mm:ss');

🕒 Familiar Moment.js API & patterns
💪 Immutable
🔥 Chainable
🌐 I18n support
📦 2kb mini library
👫 All browsers supported

Getting Started

Documentation

You can find more details, API, and other docs on day.js.org website.

Installation

npm install dayjs --save

📚Installation Guide

API

It's easy to use Day.js APIs to parse, validate, manipulate, and display dates and times.

dayjs('2018-08-08') // parse

dayjs().format('{YYYY} MM-DDTHH:mm:ss SSS [Z] A') // display

dayjs().set('month', 3).month() // get & set

dayjs().add(1, 'year') // manipulate

dayjs().isBefore(dayjs()) // query

📚API Reference

I18n

Day.js has great support for internationalization.

But none of them will be included in your build unless you use them.

import 'dayjs/locale/es' // load on demand

dayjs.locale('es') // use Spanish locale globally

dayjs('2018-05-05').locale('zh-cn').format() // use Chinese Simplified locale in a specific instance

📚Internationalization

Plugin

A plugin is an independent module that can be added to Day.js to extend functionality or add new features.

import advancedFormat from 'dayjs/plugin/advancedFormat' // load on demand

dayjs.extend(advancedFormat) // use plugin

dayjs().format('Q Do k kk X x') // more available formats

📚Plugin List