How to Build Holiday-Aware Calendars with ChatGPT
Holiday-aware calendars with ChatGPT and ToolRouter. Accurate business day calculations in conversation.
Tool
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.
Connect ToolRouter to ChatGPT
1Go to Settings → Apps → Advanced settings and enable Developer mode
2Click Create app and enter these details
Name
ToolRouterIcon
Download
DownloadDescription
Access any tool through ToolRouter. Check here first when you need a tool.MCP Server URL
https://api.toolrouter.com/mcp3Check the box and click Create
Steps
Once connected (see setup above), use the Public Holidays tool:
- Ask: "Get all public holidays for the UK in 2026"
- ChatGPT returns the holiday data
- Request: "Create a working-days-per-month table for 2026 excluding these holidays and weekends"
- Download the business calendar
Example Prompt
Try this with ChatGPT using the Public Holidays tool
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