MCP Server: io.github.Junhui20/mycal

The io.github.Junhui20/mycal MCP server provides Malaysia calendar data, covering public holidays, school terms, and business days, along with a leave optimizer. It exposes 13 tools through MCP for AI tool integrations, with packages referenced for mycal-core, mycal-sdk, and mycal-mcp-server.

🛠️ Key Features

Malaysia public holidays
School terms
Business days
Leave optimizer
13 tools exposed via MCP

🚀 Use Cases

Retrieve Malaysia holiday and school calendar information
Determine business day dates
Optimize leave planning using the leave optimizer
Integrate calendar lookups into AI workflows via MCP

⚡ Developer Benefits

Structured MCP access to calendar data
Tool-based interface (13 tools)
Associated npm packages: mycal-core, mycal-sdk, mycal-mcp-server

⚠️ Limitations

Scope is limited to Malaysia calendar data (public holidays, school terms, business days)

Malaysia Calendar API

Malaysia's most complete calendar API — public holidays, school calendar, exam schedules, and MCP server for AI tools.

Data source: Official government gazette (JPM BKPP), JAKIM, KPM, MPM. Not scraped from third-party websites.

Packages

Published to npm under the @catlabtech scope:

Package	Purpose	Install
`@catlabtech/mycal-core`	Shared types, Zod schemas, and calendar/business-day logic	`npm install @catlabtech/mycal-core`
`@catlabtech/mycal-sdk`	TypeScript client SDK for the REST API	`npm install @catlabtech/mycal-sdk`
`@catlabtech/mycal-mcp-server`	MCP server exposing 13 calendar tools for AI agents	`npm install @catlabtech/mycal-mcp-server`

Features

49 public holidays for 2026 from official gazette (Warta Kerajaan) — federal + state-specific
16 states + 3 Federal Territories with aliases (KL, JB, Penang, etc.)
Weekend-aware — Kedah/Kelantan/Terengganu use Fri-Sat (Kumpulan A), all others use Sat-Sun (Kumpulan B), with Johor's historical switch tracked
Cuti ganti (replacement holiday) auto-calculation per state weekend config
Business day calculator — per-state, holiday-aware
School calendar — terms, holidays, KPM cuti perayaan (Lampiran A/B/C)
Exam schedules — SPM, STPM, MUET, PT3
iCal subscription feeds — per-state .ics feeds
MCP Server for AI agents — 13 tools for Claude, ChatGPT, and other assistants
TypeScript SDK (@catlabtech/mycal-sdk) with typed responses
OpenAPI 3.1 spec + interactive docs
Trilingual — Bahasa Melayu, English, Chinese names (三语支持)

Quick Start

bash

# Clone and install
git clone https://github.com/Junhui20/malaysia-calendar-api.git
cd malaysia-calendar-api
pnpm install

# Build shared packages
pnpm --filter @catlabtech/mycal-core build
pnpm --filter @catlabtech/mycal-sdk build

# Run API locally (http://localhost:8787)
cd packages/api && npx wrangler dev

# Run web site locally (http://localhost:4321)
pnpm --filter @mycal/web dev

# Validate data
pnpm validate

# Run tests
pnpm test

API Examples

Base URL: https://mycal-api.huijun00100101.workers.dev/v1

List holidays

bash

# All holidays for Selangor in 2026
curl "https://mycal-api.huijun00100101.workers.dev/v1/holidays?year=2026&state=selangor"

# Islamic holidays only
curl "https://mycal-api.huijun00100101.workers.dev/v1/holidays?year=2026&type=islamic"

# March holidays for KL
curl "https://mycal-api.huijun00100101.workers.dev/v1/holidays?year=2026&state=KL&month=3"

Check a date

bash

# Is March 21 a holiday/weekend/working day?
curl "https://mycal-api.huijun00100101.workers.dev/v1/holidays/check?date=2026-03-21&state=KL"

Response:

json

{
  "data": {
    "date": "2026-03-21",
    "dayOfWeek": "Saturday",
    "isHoliday": true,
    "isWeekend": true,
    "isWorkingDay": false,
    "isSchoolDay": false,
    "holidays": [
      {
        "id": "2026-hari-raya-aidilfitri-1",
        "name": { "ms": "Hari Raya Aidilfitri", "en": "Eid al-Fitr", "zh": "开斋节" },
        "type": "islamic",
        "status": "confirmed"
      }
    ]
  }
}

Business days

bash

# Count working days in March for Selangor
curl "https://mycal-api.huijun00100101.workers.dev/v1/business-days?start=2026-03-01&end=2026-03-31&state=selangor"

# Add 10 business days to a date
curl "https://mycal-api.huijun00100101.workers.dev/v1/business-days/add?date=2026-03-01&days=10&state=selangor"

School calendar

bash

# Is this a school day?
curl "https://mycal-api.huijun00100101.workers.dev/v1/school/is-school-day?date=2026-03-21&state=selangor"

# School holidays for Kumpulan B
curl "https://mycal-api.huijun00100101.workers.dev/v1/school/holidays?year=2026&group=B"

# Exam schedule
curl "https://mycal-api.huijun00100101.workers.dev/v1/school/exams?year=2026&type=spm"

Next holiday

bash

# Next holiday for Penang
curl "https://mycal-api.huijun00100101.workers.dev/v1/holidays/next?state=penang"

State resolution

bash

# Resolve alias
curl "https://mycal-api.huijun00100101.workers.dev/v1/states/resolve?q=kl"
# -> { "data": { "canonical": "kuala-lumpur", "group": "B" } }

Full API Reference

Endpoint	Description
`GET /v1/holidays`	List holidays (filter by year, state, type, status, month)
`GET /v1/holidays/check`	Is this date a holiday/weekend/working day/school day?
`GET /v1/holidays/today`	Today's holiday status
`GET /v1/holidays/next`	Next upcoming holiday
`GET /v1/holidays/between`	Holidays in date range
`GET /v1/holidays/leave-optimizer`	Suggest annual-leave days to spend for the longest consecutive break
`GET /v1/business-days`	Count business days between dates
`GET /v1/business-days/add`	Add N business days to a date
`GET /v1/states`	All 16 states + 3 FTs with weekend config
`GET /v1/states/resolve`	Resolve alias (KL, penang, jb) to canonical code
`GET /v1/school/terms`	School term dates + day counts
`GET /v1/school/holidays`	School holidays + KPM cuti perayaan
`GET /v1/school/exams`	SPM, STPM, MUET, PT3 schedule
`GET /v1/school/is-school-day`	Is this a school day?
`GET /v1/feed/ical/:state`	iCal subscription feed
`GET /v1/feed/csv/:state`	CSV/spreadsheet export of holidays
`GET /v1/data/*`	Raw, cacheable open-data snapshots — `manifest`, `states`, `holidays/:year`, `all` (no API key required)
`GET /v1/prayer-times/:zone`	JAKIM prayer times for a zone (MYT-formatted); `GET /v1/prayer-times/zones` lists the zone directory
`POST /v1/keys`	Issue an API key (admin-gated for now; `GET /v1/keys/whoami` checks the caller's tier)

See the full OpenAPI 3.1 spec for request/response schemas.

SDK Usage

typescript

import { MyCalClient } from "@catlabtech/mycal-sdk";

const cal = new MyCalClient();

// Check if a date is a working day
const result = await cal.check("2026-03-21", "selangor");
console.log(result.isWorkingDay); // false

// List holidays
const holidays = await cal.holidays({ year: 2026, state: "KL" });

// Business days
const workDays = await cal.businessDays("2026-03-01", "2026-03-31", "selangor");
console.log(workDays.businessDays); // 22

// School calendar
const terms = await cal.school.terms({ year: 2026, group: "B" });
const exams = await cal.school.exams({ year: 2026, type: "spm" });
const isSchool = await cal.school.isSchoolDay("2026-03-21", "selangor");

MCP Server

Connect the Malaysia Calendar API to Claude, ChatGPT, or any MCP-compatible AI assistant.

Setup with Claude Desktop / Claude Code

Add to your MCP configuration:

json

{
  "mcpServers": {
    "malaysia-calendar": {
      "command": "npx",
      "args": ["@catlabtech/mycal-mcp-server"]
    }
  }
}

Available Tools (13)

Tool	Description
`get_malaysia_holidays`	Get public holidays (filter by year, state, type)
`check_malaysia_holiday`	Check if a date is a holiday or working day
`next_malaysia_holiday`	Find the next upcoming holiday
`malaysia_business_days`	Count working days between two dates
`malaysia_long_weekends`	Find long weekends (3+ days)
`malaysia_leave_optimizer`	Find the most efficient leave days to take to maximise consecutive days off
`list_malaysia_states`	List all states with weekend config
`resolve_malaysia_state`	Resolve alias (KL, JB) to canonical code
`malaysia_holiday_changes`	Recent data changes
`malaysia_school_terms`	School term dates and day counts
`malaysia_school_holidays`	School holidays (cuti penggal, cuti perayaan)
`malaysia_exams`	SPM, STPM, MUET, PT3 exam schedule
`malaysia_is_school_day`	Check if a date is a school day

State Codes

Code	Aliases	Group	Weekend
`johor`	jhr, jb	B	Sat-Sun (was Fri-Sat 2014-2024)
`kedah`	kd, kdh	A	Fri-Sat
`kelantan`	kel, kb	A	Fri-Sat
`terengganu`	trg, kt	A	Fri-Sat
`perak`	prk, ipoh	B	Sat-Sun
`pulau-pinang`	penang, pg	B	Sat-Sun
`selangor`	sel, sgr	B	Sat-Sun
`negeri-sembilan`	ns, n9	B	Sat-Sun
`melaka`	mlk, malacca	B	Sat-Sun
`pahang`	phg, kuantan	B	Sat-Sun
`perlis`	pls, kangar	B	Sat-Sun
`sabah`	sbh, kk	B	Sat-Sun
`sarawak`	swk, kuching	B	Sat-Sun
`kuala-lumpur`	kl	B	Sat-Sun
`wp-putrajaya`	putrajaya, pjy	B	Sat-Sun
`wp-labuan`	labuan, lbn	B	Sat-Sun

State aliases are case-insensitive. Use GET /v1/states/resolve?q=kl to resolve any alias to the canonical code.

Project Structure

code

malaysia-calendar-api/
├── data/                        # JSON data files (source of truth / 数据源)
│   ├── holidays/
│   │   ├── 2024.json            # Holiday data per year
│   │   ├── 2025.json
│   │   └── 2026.json
│   ├── school/
│   │   ├── terms-2026.json      # School terms (Kumpulan A + B)
│   │   ├── holidays-2026.json   # School holidays + KPM cuti perayaan
│   │   └── exams-2026.json      # SPM, STPM, MUET, PT3 schedules
│   ├── states.json              # 16 states + 3 FT, aliases, weekend history
│   └── known-fixed-holidays.json
├── packages/
│   ├── core/                    # Shared business logic (types, schemas, utils)
│   │   └── src/
│   │       ├── types.ts         # Holiday, State, SchoolTerm, Exam interfaces
│   │       ├── schemas.ts       # Zod validation schemas
│   │       ├── filter.ts        # Query filtering logic
│   │       ├── replacement.ts   # Cuti ganti calculation
│   │       ├── state-resolver.ts
│   │       ├── business-days.ts
│   │       └── school.ts        # School term/holiday/exam logic
│   ├── api/                     # Hono API on Cloudflare Workers
│   ├── mcp-server/              # MCP Server (13 tools)
│   ├── sdk/                     # TypeScript client SDK (@catlabtech/mycal-sdk)
│   └── web/                     # Astro + Starlight — marketing site, demos, docs
├── scripts/
│   ├── validate-data.ts         # 5-layer data validation pipeline
│   └── sync-to-kv.ts           # JSON -> Cloudflare KV denormalization
├── openapi.yaml                 # OpenAPI 3.1 spec (spec-first)
├── pnpm-workspace.yaml
└── turbo.json

Data Sources

All data is sourced from official Malaysian government publications:

Source	Data	URL
JPM BKPP	Federal Gazette / Warta Kerajaan (public holidays)	kabinet.gov.my
JAKIM	Takwim Hijri-Miladi (Islamic calendar)	e-solat.gov.my
KPM	Kalendar Akademik / school calendar (Lampiran A/B/C)	moe.gov.my
MPM	STPM & MUET exam schedules	mpm.edu.my
State Portals	State-specific holidays (16 states)	*.gov.my

Holiday data includes gazette references (e.g., P.U.(B) 305/2025) for traceability.

Deploy

Two parts deploy independently:

API → Cloudflare Workers

bash

pnpm --filter @catlabtech/mycal-core build
cd packages/api && npx wrangler deploy

Website → Cloudflare Pages

bash

pnpm --filter @catlabtech/mycal-core build
pnpm --filter @catlabtech/mycal-sdk build
pnpm --filter @mycal/web build

# Direct upload via wrangler (requires CLOUDFLARE_API_TOKEN + CLOUDFLARE_ACCOUNT_ID)
cd packages/web
npx wrangler pages deploy dist --project-name=mycal-web

First-time Pages setup:

Create a Pages project named mycal-web in the Cloudflare dashboard.
Either connect the GitHub repo for automatic builds, or rely on the GitHub Actions workflow (.github/workflows/deploy.yml) to push via wrangler pages deploy.
Required GitHub secrets: CLOUDFLARE_API_TOKEN, CLOUDFLARE_ACCOUNT_ID.

CI/CD

GitHub Actions handles:

PR gate — Zod schema validation + cross-source checks on every PR
Deploy — On merge to main: build and deploy API to Workers + Web to Pages in parallel
Daily scrape — Government portal monitoring for updates
Rukyah monitor — Islamic date confirmation tracking

Contributing

See CONTRIBUTING.md for how to:

Report a missing holiday or cuti peristiwa
Fix data errors
Add new features

License

MIT

io.github.Junhui20/mycal

MCP Server: io.github.Junhui20/mycal

🛠️ Key Features

🚀 Use Cases

⚡ Developer Benefits

⚠️ Limitations

Malaysia Calendar API

Links

Packages

Features

Quick Start

API Examples

List holidays

Check a date

Business days

School calendar

Next holiday

State resolution

Full API Reference

SDK Usage

MCP Server

Setup with Claude Desktop / Claude Code

Available Tools (13)

State Codes

Project Structure

Data Sources

Deploy

API → Cloudflare Workers

Website → Cloudflare Pages

CI/CD

Contributing

License

Install

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