Day.js Calendar Systems Plugin extends Day.js library to allow the use of different non-gregorian calendar systems like:

• Persian (a.k.a.: Jalaali, Shamsi, Khorshidi),
• Arabic (a.k.a: Hijri, Islamic, Umalqura, Ghamari),
• Hebrew (a.k.a: Jewish),
• Amazigh (a.k.a: Berber),
• and more to come (PRs are welcome).

With this plugin, Day.js will be available to more than 200 million additional users worldwide (Estimated number of non-gregorian calendar users).

With the @calidy/dayjs-calendarsystems plugin, we bring the capacity to run and use all non-gregorian calendar systems to Dayjs.

Features

• Register and use different calendar systems.
• Typescript exports and definitions.
• Compatible with all official Dayjs plugins.
• No need for hacks, use dayjs apis in the standard way.
• Small and light plugin, no overhead.
• Convert between different calendar systems.
• 🌍 🗓️ 📅 Default Gregorian calendar system included.
• 🌍 🗓️ 🇮🇷 Persian Calendar system available.
• 🌍 🗓️ 🇸🇦 Islamic (Hijri, Umalqura) Calendar system. Note: we will use the default "islamic-umalqura" calendar system for "islamic" calendar system.
• 🌍 🗓️ 🇮🇱 Hebrew (Jewish) Calendar system.
• 🌍 🗓️ ⵣ Amazigh (Berber) Calendar system.
• 🌍 🗓️ 🇪🇹 [WIP] Ethiopian Calendar system.
• 🌍 🗓️ 🇮🇳 [TODO] Indian Calendar system.
• 🌍 🗓️ 🇨🇳 [TODO] Chinese Calendar system.
• 🌍 ✅ Fixes translations of month names in Dayjs for non-gregorian and gregorian calendar systems (This is based on my knowledge, please PR to add more fixes).
• [TODO] Parse date strings from different calendar systems
• [TODO] Add more tests for all Dayjs Plugins

API

All API operations and Dayjs plugins may be used as instructed by Dayjs with the specific calendar system when this plugin is used, for more information checkout Dayjs Documentation

Installation

NPM

npm install --save @calidy/dayjs-calendarsystems

YARN

yarn add --save @calidy/dayjs-calendarsystems

Usage

import dayjs from "dayjs";
import calendarSystems from "@calidy/dayjs-calendarsystems";

// Note: Gregorian Calendar System is included by default,
//       so there is no need to import the `GregoryCalendarSystem` file here.

import PersianCalendarSystem from "@calidy/dayjs-calendarsystems/calendarSystems/PersianCalendarSystem";

// ...
// ALL YOU OTHER dayjs.extend() calls
// ...
// After all other dayjs plugins are initialized, extend dayjs with our calendar systems plugin:
dayjs.extend(calendarSystems);

// Register new calendar system
dayjs.registerCalendarSystem("persian", new PersianCalendarSystem());

// Set default dayjs config (for all following instances) to a specific calendar system:
// dayjs.toCalendarSystem("persian");

// Convert a dayjs instance to a specific calendar system.
let date = dayjs().toCalendarSystem("persian");

// Convert a date from a specific calendar system without initializing a dayjs instance.
date = dayjs.fromCalendarSystem('persian', 1402, 2, 17);

Adding Custom Calendar Systems

This plugin allows you to add your own custom calendar systems. Each calendar system must be an object with the following properties:

• convertToGregorian(year: number, month: number, day: number): { year: number; month: number; day: number; } | void: a function that converts a date from the current calendar system to the Gregorian calendar.
• convertFromGregorian(date: Date | string | number | undefined | null): { year: number; month: number; day: number; } | void: a function that converts a Gregorian date to the current calendar system.

License

This project is DUAL LICENSED.

• For non-commercial use, this project uses the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) licence.
• For commercial use (when you or your company earns revenue directly or indirectly using this project), a valid commercial licensed is required.

Please see the LICENSE.md file for details.

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

Please see the CONTRIBUTING.md file for details. Please see the CODE_OF_CONDUCT.md file for details.

Support

If you have any issues or feature requests, please file issues and feature requests on the GitHub repo.

Acknowledgements

• Day.js, for the amazing date library.
• Dayjs-Jalali-Plugin and Jalaliday Plugin, for inspiring this project's Persian calendar integration.