Timezone Overlap Planner
Find the best meeting time across multiple time zones. Add cities, set working hours, and see the mutual overlap window and ranked meeting slots.
How to use this tool
- Add each participant's city using the dropdown (2 to 6 cities).
- Set the working-day start and end hours that apply to every city (e.g. 9 to 17).
- Read the 24-hour band: green cells are the hours when everyone is working.
- Pick a slot from the suggested list — it shows that hour in each city's local time.
- Copy the URL to share the exact plan with your team.
Most timezone tools only convert a single clock. The Timezone Overlap Planner solves the harder problem distributed teams actually have: finding a meeting time that lands inside everyone's working day at once. Add 2–6 cities, set the working hours, and it computes the mutual overlap window for you.
The 24-hour band shows each city's working hours aligned to a common reference, and the green cells mark the hours where everyone is at their desk. The suggested-slot list translates each of those hours back into every participant's local time, so you can pick a slot and paste it straight into a calendar invite.
Built for remote and async teams, digital nomads, and anyone scheduling across continents. Your city list and working hours are saved in the URL, so a shared link reproduces the exact plan.
How it works
The Timezone Overlap Planner helps distributed teams find a meeting time that falls within working hours for everyone. Add each participant's city or timezone, define working hours for each (e.g. 9 AM to 6 PM), and the tool calculates the windows where all participants overlap.
The results show the overlap window in each participant's local time and rank the available slots by how central they fall in everyone's working day, so you can choose a time that is equally inconvenient for no one.
This is especially useful for global teams spanning Asia, Europe, and the Americas, where the intersection of business hours can be narrow or non-existent, helping you identify whether an asynchronous approach may be more practical.
Worked example
Find a meeting time for New York, London, and Singapore
- Add New York (ET, working hours 9 AM - 6 PM).
- Add London (GMT/BST, working hours 9 AM - 6 PM).
- Add Singapore (SGT, working hours 9 AM - 6 PM).
- The tool shows the overlap: 9 AM - 10 AM London time covers ET early morning — a narrow window.
- Review the ranking to confirm whether async communication is more practical than a live meeting.
A narrow or absent overlap is clearly flagged; the planner suggests the least-bad option.
Common mistakes to avoid
- Using a city that observes DST to represent an entire region where some areas do not — pick the specific city for accuracy.
- Setting working hours too narrowly (e.g. 10 AM - 3 PM) and then concluding there is no overlap when a wider window would reveal one.
- Scheduling in the first or last 15 minutes of an overlap window, leaving no buffer for the meeting to start late.
Key terms
- Overlap window
- The time range during which all participants are within their defined working hours simultaneously.
- UTC offset
- The difference between a timezone and Coordinated Universal Time, expressed in hours and minutes (e.g. UTC+8 for Singapore).
- DST (Daylight Saving Time)
- A seasonal clock adjustment that shifts some timezones by one hour; the planner accounts for current DST status automatically.
Frequently asked questions
- How is the overlap calculated?
- For each of the 24 UTC hours we convert to each city's local time and check whether it falls inside that city's working hours. Hours where every city is inside working hours are the mutual overlap, shown in green.
- Does it handle daylight saving time?
- Yes — it uses the browser's Intl.DateTimeFormat with the IANA timezone, which applies the current DST rules. If Intl is unavailable it falls back to a built-in offset table so the tool still works.
- Can I share my plan with my team?
- Yes. The selected cities and working hours are encoded in the page URL. Copy the link from your address bar (or the share buttons) and anyone who opens it sees the same overlap plan.