2KB immutable date time library alternative to Moment.js with the same modern API
npm install dayjs-extFast 2kB alternative to Moment.js with the same modern API
(This is an extended fork of the original project.)
alt="Gzip Size">
alt="NPM Version">
> 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
* New plugin "[customParseFormat]" to parse input strings using custom formats.
* New plugin "[localizableFormat]" to format dates according to the chosen locale.
* New plugin "[timeZone]" to parse from and format to a date string using a time zone specified by its canonical name.
* Corrected plugin "[relativeTime]" honouring grammar rules of the supported languages.
* "[UTC mode]" for working in UTC, or for working with date-only values without the time part.
* Additional locales ([cs], [ru], [sk], [uk]).
* Check for dayjs instance by the instanceof operator.
Day.js is usually imported via a "proxy module", which loads required plugins and registers required language packs. For example, via the following dayjs-local.js:
`js
// Load dayjs, plugins and language packs.
import dayjs from 'dayjs-ext'
// import "timeZone-1900-2050", "timeZone-1970-2038"
// or "timeZone-2012-2022" to save your package size
import timeZonePlugin from 'dayjs-ext/plugin/timeZone'
import customParseFormat from 'dayjs-ext/plugin/customParseFormat'
import localizableFormat from 'dayjs-ext/plugin/localizableFormat'
import relativeTime from 'dayjs-ext/plugin/relativeTime'
import 'dayjs-ext/locale/cs'
import 'dayjs-ext/locale/sk'
// Register plugins and language packs; Czech will be the default language.
dayjs.extend(timeZonePlugin)
.extend(customParseFormat)
.extend(localizableFormat)
.extend(relativeTime)
.locale('cs')
export default dayjs
`
Typical usage scenarios:
`js
import dayjs from './dayjs-local'
// Load a date+time from a storage and show it to the user.
const dateTime = dayjs('2018-10-28T18:45:00.000Z')
console.log(dateTime.format({ format: 'L LT', timeZone: 'Europe/Prague' }))
// Prints "28.10.2018 19:45".
console.log(dateTime.fromNow())
// Prints "před 5 hodinami" (5 hours ago).
// Read a date+time from the user and format it for the storage.
const dateTime = dayjs('28.10.2018 19:45', { format: 'L LT', timeZone: 'Europe/Prague' })
console.log(dateTime.toISOString())
// Prints "2018-10-28T18:45:00.000Z".
// Set only the date; zero the time and prevent local time zone conversion.
const dateOnly = dayjs('2018-10-28', { utc: true })
console.log(dateOnly.format({ format: 'YYYY-MM-DD' }))
// Prints "2018-10-28" anytime and anywhere.
`
If used in the browser, the following scripts would be needed:
`html`
<-- include "index-1900-2050", "index-1970-2038"
or "index-2012-2022" to save your package size -->
`console`
npm install dayjs-ext --save
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
`
Day.js has great support for internationalization.
But none of them will be included in your build unless you use it.
`javascript
import 'dayjs-ext/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
A plugin is an independent module that can be added to Day.js to extend functionality or add new features.
`javascript
import timeZone from 'dayjs-ext/plugin/timeZone' // load on demand
dayjs.extend(timeZone) // use plugin
dayjs().format('D.M.YYYY H:mm',
{ timeZone: 'Europe/Berlin' }) // convert to CET before formatting
``
See the [sponsor list at the original project]. Thank you for your support!
See the [contributor list at the original project]. Thank you for your help!
Day.js is Extended licensed under a MIT License.
[original project]: https://github.com/iamkun/dayjs
[sponsor list at the original project]: https://github.com/iamkun/dayjs#sponsors
[contributor list at the original project]: https://github.com/iamkun/dayjs#sponsors
[customParseFormat]: ./docs/en/Plugin.md#customParseFormat
[localizableFormat]: ./docs/en/Plugin.md#localizableformat
[timeZone]: ./docs/en/Plugin.md#timezone
[relativeTime]: ./docs/en/Plugin.md#relativetime
[UTC mode]: ./docs/en/API-reference.md#utc-mode
[cs]: ./src/locale/cs.js
[ru]: ./src/locale/ru.js
[sk]: ./src/locale/sk.js
[uk]: ./src/locale/uk.js