Dayjs-timezone-iana-plugin

DayJS timezone plugin alternative to manage DST correctly, using https://www.iana.org/time-zones

Usage

``sh
npm i dayjs-timezone-iana-plugin
`

In the code:

`js
// -> remove dayjs.extend(timezone)
dayjs.extend(utc)
dayjs.extend(require('dayjs-timezone-iana-plugin'))

dayjs('2014-06-01 12:00').tz('America/New_York')
// You can set a default timezone
dayjsFactory.tz.setDefault('America/New_York')
`

Philosophy

The code is quite simple and is largely inspired by moment-timezone.

It includes the latest database IANA 2021e (96KB compressed).
It takes more space than the method used by DayJS or Luxon. But it works even if NodeJS is compiled with small-icu.

How to update IANA DB

- go to https://github.com/moment/moment-timezone/tree/develop/data/unpacked
- download latest.json https://github.com/moment/moment-timezone/blob/develop/data/unpacked/latest.json
- execute npm run optimize`
- commit, push

Todo

- [ ] Add lot of tests (see moment-timezone tests)

Changelog

0.2.0
- Update iana timezone db (2025)

0.1.0
- First version

Maintained by https://carbone.io/ and https://www.easilys.com/