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Day.js: 2kB Immutable Date-Time Library Alternative to Moment.js
Day.js is a 2kB immutable date-time library alternative to Moment.js with the same modern API. It is designed to be minimal, fast, and easy to use.
JavaScript
Added on 2025年5月11日47,774
Stars2,356
ForksJavaScript
LanguageProject Introduction
Summary
Day.js is a minimalist JavaScript library for parsing, validating, manipulating, and formatting dates and times. It provides a clean, modern API similar to Moment.js but with a significantly smaller size and immutable operations.
Problem Solved
Many existing date-time libraries, like older versions of Moment.js, are large, mutable by default, and can significantly increase application bundle size. Day.js addresses these issues by being extremely lightweight, immutable, and providing a modern, familiar API.
Core Features
Lightweight
Tiny 2KB footprint (minified and gzipped) for minimal impact on bundle size.
Immutable
All API operations return new Dayjs objects, ensuring data integrity.
Moment.js Compatible API
Offers a similar API to Moment.js, making migration straightforward.
Extendable
Extend functionality with a flexible plugin system.
Tech Stack
JavaScript
TypeScript
Node.js
使用场景
Day.js is ideal for applications where performance and bundle size are critical, but robust date/time functionality is still required. Common use cases include:
场景一：构建高性能Web应用前端
Details
Using Day.js in modern web frameworks like React, Vue, or Angular where every KB matters.
User Value
Significantly reduce the JavaScript bundle size, leading to faster page load times and improved user experience.
场景二：Node.js后台服务中的日期处理
Details
Performing date calculations, formatting, and validation in Node.js server-side applications.
User Value
Provide a fast, reliable, and low-overhead solution for server-side date/time logic.
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