---
title: ToolRouter — Agent Use Case Guide
description: Step-by-step guide for completing a task with a specific AI agent using ToolRouter.
url: https://toolrouter.com/tools/public-holidays/use-cases/build-holiday-aware-calendars/claude
---
# How to Build Holiday-Aware Calendars with Claude

Claude builds holiday-aware business calendars with analytical precision, calculating working days per period while accounting for weekends and country-specific holidays. It asks about your fiscal calendar and industry conventions to produce working-day counts matching your actual business operations rather than generic calculations.

## Setup

claude mcp add toolrouter -- npx -y toolrouter-mcp

## Steps

1. Connect ToolRouter: claude mcp add toolrouter -- npx -y toolrouter-mcp
2. Ask Claude: "Get all public holidays for the US in 2026 using public-holidays"
3. Claude returns the complete holiday list
4. Ask: "Calculate the number of working days in each month, excluding weekends and these holidays"
5. Use the working-day counts in your planning or application

## Example Prompt

```
Get US public holidays for 2026. Then calculate working days per month excluding weekends and holidays. I need this for our project scheduling system.
```

## Tips

- Ask Claude to output the data in a format your scheduling tool can import
- Generate calendars for multiple countries and compare working-day counts
- Update your calendar data annually by re-running the query for the new year
