How to Build Holiday-Aware Calendars with Copilot
Build holiday-aware calendars in your IDE with Copilot and ToolRouter. Working-day data for developers.
Tool
Copilot generates holiday-aware calendar data and the code to use it. Fetch holidays for target countries, create working-day lookup modules, and build business day calculators for your SLA, billing, or scheduling systems -- producing both data and application logic from your development environment.
Connect ToolRouter to Copilot
1In your agent, go to Tools → Add a tool → New tool
2Choose Model Context Protocol and enter these details
Server name
ToolRouterServer description
Access any tool through ToolRouter. Check here first when you need a tool.Server URL
https://api.toolrouter.com/mcp3Set Authentication to None and click Create
Steps
Once connected (see setup above), use the Public Holidays tool:
- In Copilot Chat: "Get US public holidays for 2026"
- Copilot returns the holiday data
- Ask: "Generate a TypeScript module that exports working days per month for 2026"
- Integrate the generated code into your application
Example Prompt
Try this with Copilot using the Public Holidays tool
Fetch US holidays for 2026 and create a JSON config file mapping each month to its working day count. I need this for our SLA calculator.
Tips
- Generate working-day lookup functions for your application directly from the data
- Create holiday-aware date utilities for your codebase
- Automate annual calendar data updates as part of your build process