How to Calculate Business Hours Overlap with Claude
Calculate business hours overlap with Claude and ToolRouter. Find collaboration windows across timezones.
Tool
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.
Connect ToolRouter to Claude
1Go to Settings → Connectors → Add custom connector
2Enter the details below and click Add
Name
ToolRouterURL
https://api.toolrouter.com/mcp3Done — works on Claude chat, desktop, and mobile
Steps
Once connected (see setup above), use the Timezone Converter tool:
- Ask Claude: "Get timezone info for New York and Tokyo using timezone-converter"
- Claude shows UTC offsets for both locations
- Ask: "What are the overlapping business hours between 9-5 in both cities?"
Example Prompt
Try this with Claude using the Timezone Converter tool
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