Coptic calendar arithmetic — date conversion, Easter, and feast days. Ported to multiple languages from a single canonical spec in core/.

Same algorithms, same core/test-vectors.json contract, distributed through each language's native package manager. Every port version is kept in lockstep — the version badges below should all read the same number.

Language	Source	Package	Install
TypeScript / JavaScript	js/		npm install kiahk
Python	py/		pip install kiahk
Go	go/		go get github.com/amir-magdy-of-wizardlabz/kiahk/go
Dart / Flutter	dart/		dart pub add kiahk
Swift (SwiftPM)	swift/		add https://github.com/amir-magdy-of-wizardlabz/kiahk.git to Package.swift
Swift (CocoaPods)	swift/		pod 'Kiahk' in Podfile
C# / .NET	csharp/		dotnet add package Kiahk
C	c/		download tarball or add_subdirectory(c) in CMake

See each port's README for full install + quick-start examples, and for English + Arabic month-name rendering.

• core/algorithms.md — pseudocode for Gregorian↔Coptic, Easter, feasts
• core/feasts.json — fixed + moveable feast registry
• core/test-vectors.json — cross-port test contract

Every port must produce identical results against core/test-vectors.json.

Try it live → https://raw.githack.com/amir-magdy-of-wizardlabz/kiahk/master/demo/index.html

A small browser demo of the JS port lives in demo/. It lets you:

• Pick a Gregorian date and see its Coptic equivalent (English + Arabic month names)
• Enter a Gregorian year and view every major Coptic feast (en + ar names, fixed vs moveable)

Source: demo/index.html, demo/app.js. See demo/README.md for how to run it locally.

The hosted demo is served via raw.githack.com, a free proxy that serves GitHub files with correct MIME types. It reads master directly, so the link tracks whatever's on master at any given moment.

Licensed under the MIT License.

Maintained by Amir Magdy at WizardLabz.