esday

🚧 working in progress

esday is a JavaScript library inspired by Day.js, esday has a largely similar API to Day.js (v1.11.13), but it is written in TypeScript and fully supports es modules.

import { esday } from 'esday'
import { isTodayPlugin } from 'esday/plugins/isToday'

esday.extend(isTodayPlugin)

esday('2024-12-10').set('year', 2025).add(1, 'month').isToday()

Concepts

• Modern API: Provides the same API as Day.js, with some features moved to plugins for a simpler core.
• Immutable: esday is immutable, which means that all operations will return a new instance of esday.

Differences to Day.js

• Locale is a Plugin: no default locale!
• default value for 'Start of Week' is 1 (as in ISO 8601): 'Start of Week' is 1 ('Monday').
• default value for 'Start of Year' is 4 (as in ISO 8601): 'Start of Year' is 4.

Differences to Moment.js

• toString conforms to Day.js and uses Date.toUTCString() (returning the date in RFC 7231 format 'ddd, DD MMM YYYY HH:mm:ss [GMT]') while moment uses the format 'ddd MMM DD YYYY HH:mm:ss [GMT]ZZ'.

License

This project is licensed under the MIT License.

This project also partially contains code derived or copied from the following projects:

• Day.js