---
title: ToolRouter — Use Case
description: Step-by-step guide for a real-world ToolRouter use case with agent-specific instructions.
url: https://toolrouter.com/tools/timezone-converter/use-cases/calculate-business-hours-overlap
---
# Calculate Business Hours Overlap

When teams are spread across timezones, the overlap window -- the hours when everyone is at work simultaneously -- determines how much real-time collaboration is possible. A 2-hour overlap is enough for a standup and quick sync. Zero overlap means purely async work.

Convert business hours (typically 9-5) from each location to a common reference and find the intersection. Use timezone_info to understand UTC offsets and DST rules that affect the overlap. This is critical for staffing decisions, SLA coverage planning, and setting expectations for response times.

**Tool:** [Timezone Converter](https://toolrouter.com/tools/timezone-converter)
**Skills:** convert_time, timezone_info

## Agent Guides

- [How to Calculate Business Hours Overlap with Claude](https://toolrouter.com/tools/timezone-converter/use-cases/calculate-business-hours-overlap/claude): Guide for Claude
- [How to Calculate Business Hours Overlap with ChatGPT](https://toolrouter.com/tools/timezone-converter/use-cases/calculate-business-hours-overlap/chatgpt): Guide for ChatGPT
- [How to Calculate Business Hours Overlap with Copilot](https://toolrouter.com/tools/timezone-converter/use-cases/calculate-business-hours-overlap/copilot): Guide for Copilot
- [How to Calculate Business Hours Overlap with OpenClaw](https://toolrouter.com/tools/timezone-converter/use-cases/calculate-business-hours-overlap/openclaw): Guide for OpenClaw
