English | [简体中文](./docs/zh-cn/README.zh-CN.md) | [日本語](./docs/ja/README-ja.md) | [Português Brasileiro](./docs/pt-br/README-pt-br.md) | [한국어](./docs/ko/README-ko.md) | [Español (España)](./docs/es-es/README-es-es.md)

<p align="center"><a href="#" target="_blank" rel="noopener noreferrer"><img width="550"
                                                                             src="https://user-images.githubusercontent.com/17680888/39081119-3057bbe2-456e-11e8-862c-646133ad4b43.png"
                                                                             alt="Day.js"></a></p>
<p align="center">Fast <b>2kB</b> alternative to Moment.js with the same modern API</p>
<br>
<p align="center">
    <a href="https://unpkg.com/dayjs/dayjs.min.js"><img
            src="http://img.badgesize.io/https://unpkg.com/dayjs/dayjs.min.js?compression=gzip&style=flat-square"
            alt="Gzip Size"></a>
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                                                       alt="NPM Version"></a>
    <a href="https://travis-ci.org/iamkun/dayjs"><img
            src="https://img.shields.io/travis/iamkun/dayjs/master.svg?style=flat-square" alt="Build Status"></a>
    <a href="https://codecov.io/gh/iamkun/dayjs"><img
            src="https://img.shields.io/codecov/c/github/iamkun/dayjs/master.svg?style=flat-square" alt="Codecov"></a>
    <a href="https://github.com/iamkun/dayjs/blob/master/LICENSE"><img
            src="https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square" alt="License"></a>
    <br>
    <a href="https://saucelabs.com/u/dayjs">
        <img width="750" src="https://user-images.githubusercontent.com/17680888/40040137-8e3323a6-584b-11e8-9dba-bbe577ee8a7b.png" alt="Sauce Test Status">
    </a>
</p>

> 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.

```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

### Installation

```console
npm install dayjs --save
```

📚[Installation Guide](./docs/en/Installation.md)

### API

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

```javascript
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](./docs/en/API-reference.md)

### I18n

Day.js has great support for internationalization.

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

```javascript
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](./docs/en/I18n.md)

### Plugin

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

```javascript
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](./docs/en/Plugin.md)

## Sponsors

Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [[Become a sponsor](https://opencollective.com/dayjs#sponsor)]

<a href="https://opencollective.com/dayjs/sponsor/0/website" target="_blank"><img src="https://opencollective.com/dayjs/sponsor/0/avatar.svg"></a>
<a href="https://opencollective.com/dayjs/sponsor/1/website" target="_blank"><img src="https://opencollective.com/dayjs/sponsor/1/avatar.svg"></a>
<a href="https://opencollective.com/dayjs/sponsor/2/website" target="_blank"><img src="https://opencollective.com/dayjs/sponsor/2/avatar.svg"></a>

## Contributors

This project exists thanks to all the people who contribute.

Please give us a 💖 star 💖 to support us. Thank you.

And thank you to all our backers! 🙏
<a href="https://opencollective.com/dayjs#backers" target="_blank"><img src="https://opencollective.com/dayjs/contributors.svg?width=890" /></a>


## License

Day.js is licensed under a [MIT  License](./LICENSE).
