---
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/chatgpt
---
# How to Build Holiday-Aware Calendars with ChatGPT

ChatGPT creates business calendars accounting for holidays in formats teams can use immediately. It calculates working days per month or quarter, explains which holidays affect each period, and generates the calendar as a table, CSV, or narrative summary -- making holiday-aware scheduling accessible to anyone on the team.

## Setup

{"mcpServers":{"toolrouter":{"command":"npx","args":["-y","toolrouter-mcp"]}}}

## Steps

1. Configure ToolRouter in ChatGPT
2. Ask: "Get all public holidays for the UK in 2026"
3. ChatGPT returns the holiday data
4. Request: "Create a working-days-per-month table for 2026 excluding these holidays and weekends"
5. Download the business calendar

## Example Prompt

```
Build a 2026 business calendar for the UK. Show working days per month, accounting for all public holidays and weekends. Format as a table.
```

## Tips

- ChatGPT can calculate business days between any two dates using the holiday data
- Ask for quarterly summaries for financial planning
- Request the calendar in CSV format for spreadsheet import
