---
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/timezone-converter/use-cases/calculate-business-hours-overlap/claude
---
# How to Calculate Business Hours Overlap with Claude

Claude approaches timezone conversion as a reasoning problem, analyzing UTC offsets, daylight saving transitions, and business hour constraints across multiple regions simultaneously to find solutions that actually work for everyone involved. It evaluates trade-offs when perfect overlap is impossible, flags edge cases like upcoming DST transitions that will shift your meeting times, and explains clearly why a particular slot works or falls outside reasonable hours for specific participants.

## 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 timezone info for New York and Tokyo using timezone-converter"
3. Claude shows UTC offsets for both locations
4. Ask: "What are the overlapping business hours between 9-5 in both cities?"

## Example Prompt

```
Calculate the overlapping business hours between our London office (9am-6pm GMT) and our Singapore office (9am-6pm SGT).
```

## Tips

- Ask Claude to calculate overlap for all office pairs if you have 3+ locations
- Factor in DST -- overlap changes twice a year for many city pairs
