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Connect Calendar & Holiday Engine to ChatGPT and Claude

Set it up once and it works in ChatGPT, Claude, Cursor, and any other client you love. It all runs safely in the background, so you can relax and focus on what really matters. Get precise holiday dates across multiple global calendar systems.

Ask AI about this Connector

Developed, maintained, and hosted by Vinkius.

MCP VERIFIED · PRODUCTION READY · VINKIUS GUARANTEED

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Works with modern AI clients that support MCP, including ChatGPT, Claude, Cursor, and more.

ChatGPTClaudeCursorPerplexityGeminiMicrosoft CopilotRaycastMeta AI

Your AI does the work. We keep it safe and sound.

No other AI tool gives you this. Your workflow runs in the client you already love, your account stays protected, and you decide what the agent can and cannot do. It is the whole reason to make the switch.

Each Connector lives inside our infrastructure, the same place where your workflow runs. The three things below are already part of it, working quietly in the background so you never have to think about them. Nothing to add, nothing to set up, nothing to worry about.

A futuristic MCP client docking bay
V8 Isolate01

Each Connector runs inside its own sealed environment.

Each Connector runs inside its own sealed V8 runtime — no access to your files, your system, or other servers. A Connector never sees past its own request.

Kill Switch02

One switch stops every agent. Instantly.

One action deactivates every Connector, revokes every token, and ends every session at once. AI Governance keeps the record.

FinOps per User03

Spending limits that pause instead of surprise.

Every user keeps their own connections and credentials, isolated from everyone else. Anything that would cross your spending limit is held for your approval, not billed.

Three controls, built into the layer your AI connects through.

Curated set · 3 capabilities

We ship only the actions that matter.

Capability set01 / 01

01-03

3 capabilities in this set.

Part of 3 available through Calendar & Holiday Engine.

  1. 01

    Check holiday proximity

    This capability tells your agent how many days remain until an upcoming holiday or how many days have passed since the last one.

  2. 02

    Get holiday details

    This capability provides specific metadata and the exact name for a single holiday in a given year.

  3. 03

    Get holidays by year

    This capability returns a complete list of holidays for a specific year, with an option to filter by country code.

Real work

What teams actually run

01

Global Scheduling

An agent checks for upcoming holidays in a specific country to prevent scheduling meetings on non-working days.

02

Cultural Awareness

A personal assistant agent identifies when religious holidays like Eid or Passover occur to suggest appropriate greetings.

03

Historical Research

A researcher asks the agent for holiday dates in the 1800s to verify historical timelines.

04

Countdown Logic

A task management agent calculates exactly how many days are left until a major holiday to trigger reminders.

One connector, every AI

Calendar & Holiday Engine works with the most popular AI clients.

These are the most popular clients, each with a step-by-step guide: one link, set up once, with governance and visibility built in. And because everything runs on the MCP standard, the same connection also works in any other compatible client — nothing to rebuild.

ClaudeClaudeChatGPTChatGPTGeminiGeminiPerplexityPerplexityGrokGrokMicrosoft CopilotMicrosoft CopilotCursorCursorVS CodeVS CodeWindsurfWindsurfJetBrainsJetBrainsClineClineLangChainLangChainVercel AI SDKVercel AI SDKLovableLovableZ.aiZ.aiRaycastRaycastQwen CodeQwen CodeKimi CodeKimi CodeLe ChatLe Chat

Building your own app? The connector is yours to use.

You don't need a client to put Calendar & Holiday Engine to work: the same hosted connection plugs into your own applications and agent code, with the same governance on every request. Build with it, chat with it — one connection for both.

Observed, not estimated

892ms average. Fast in production.

Calendar & Holiday Engine is checked daily against the live service.

Daily averagePeak 1120ms
Oct 3Today
Fastest day
654ms
Slowest day
1120ms
14-day trend
Stable-1%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 3 capabilities arrive ready to run.

Preview access · not provider authentication

The vk_preview_* token belongs to Vinkius preview infrastructure. It lets Claude discover and display the capabilities of Calendar & Holiday Engine, so you can see the experience inside your AI.

It does not authenticate your account with Calendar & Holiday Engine. Actions requiring credentials or live account data may not run until you activate the Connector and authorize the service.

Calendar & Holiday Engine Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_QjSKggQJHu9raCtEmHkfqTFaoKRductNOiRw2Gvz/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — Calendar & Holiday Engine capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "calendar-holiday-engine-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_QjSKggQJHu9raCtEmHkfqTFaoKRductNOiRw2Gvz/mcp"
    }
  }
}
  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Step-by-step instructions for each client are in the guide. How to connect

Guided setup for Claude? Set up Calendar & Holiday Engine in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work Calendar & Holiday Engine owners hand off.

This MCP is built for anyone building agents that need to interact with global schedules or cultural calendars.

  • 01

    Software Developers

    They hand off complex calendar math to the agent to build scheduling features.

  • 02

    Project Managers

    They use the agent to check for upcoming regional holidays that might impact project timelines.

  • 03

    Travel Planners

    They task the agent with identifying holiday periods in different countries to avoid or target specific dates.

FAQ

Questions Calendar & Holiday Engine owners ask.

  • 01

    Which calendars does this MCP support?

    It supports Gregorian, Islamic (Hijri), Hebrew (Lunisolar), Chinese (Lunisolar), and Hindu calendars.

  • 02

    Can I filter holidays by country?

    Yes, you can provide a country code when using the capability to get holidays by year to filter for specific public holidays.

  • 03

    What is the date range for these calculations?

    The engine can calculate dates for any year between 1583 and 9999.

  • 04

    How do I find out how many days are left until a holiday?

    Your agent can use the check_holiday_proximity capability to find the distance to an upcoming or past holiday.

  • 05

    Does this work with Claude or Cursor?

    Yes, it works with any MCP-compatible client including Claude, Cursor, Windsurf, and VS Code.

  • 06

    What is the supported year range?

    The engine supports any year from 1583 to 9999.

  • 07

    Can I check if a holiday is a public holiday?

    Yes, by providing a valid ISO 3166-1 alpha-2 country code, the capabilities will indicate if the holiday is officially recognized in that territory.

  • 08

    Which calendar systems are supported?

    The engine supports Gregorian, Christian-Movable, Hijri, Hebrew, Chinese, Hindu, and Secular calendar systems.

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