Changing language starts a new session. Save your result first.
How to use this tool
- 1
Select a Date
Select the UTC calendar day to search. The range runs from midnight to midnight UTC, so local dates may differ. Check adjacent UTC dates for shifts crossing that boundary.
- 2
Add Participants and Their Working Hours
Add each team member's timezone and their working start and end times in their local time. Overnight shifts that span midnight are supported.
- 3
Configure Options
Set the minimum shared-window duration beside the date. Open Settings to choose 15-, 30- or 60-minute chart cells. Result boundaries are calculated to the minute.
- 4
Click Find Overlaps
Click the "Find Overlaps" button to see the visual timeline and a ranked list of windows where all participants are simultaneously available.
- 5
Share or Export Results
Copy a shareable link to send the configuration to your team, or export any overlap window as a CSV file with local times per participant for use in calendar invites.
Want to learn more?
📖How to Find Working Hours Overlap for Remote Teams in 2026 (Free Tool)
Related Tools
Meeting Time Calculator
Find meeting times across timezones with DST support.
Try Meeting Time Calculator →Date Calculator
Date differences, age, business days, add/subtract dates.
Try Date Calculator →Timer & Stopwatch
Countdown and stopwatch with laps and quick presets.
Try Timer & Stopwatch →Pomodoro Timer
Boost productivity with the Pomodoro Technique. Customizable focus/break durations, auto-start, sound alerts, session tracking, and keyboard shortcuts.
Try Pomodoro Timer →Frequently Asked Questions
How many participants can I add to the working hours overlap calculator?
Add up to 50 participants. The result is the intersection of all local shifts. Adding another person can shorten or remove the shared window.
Does the calculator handle Daylight Saving Time (DST)?
Yes. City options use named IANA time zones through the browser, including date-specific daylight-saving transitions. Keep your browser and operating system updated when time-zone rules change.
Can I set overnight working hours that span midnight?
Yes. If a participant's end time is earlier than their start time (e.g. 10 PM – 6 AM), the calculator treats it as an overnight shift spanning midnight. This correctly handles night shift workers and teams in Oceania with schedules that cross midnight UTC.
What does the visual timeline show?
The timeline shows a 24-hour UTC grid. Each participant row highlights their working hours in purple with their local time beneath. A green overlap row shows windows where all participants are simultaneously available. A red marker shows the current UTC time when today's date is selected.
How do I share the schedule configuration with my team?
Click "Share Setup" to generate a URL containing the date, participants, time zones and local working hours. Anyone opening the link can review the setup and run the calculation.
What does the minimum overlap setting do?
The minimum overlap filter removes windows shorter than the specified duration (default: 60 minutes). This prevents very short windows from cluttering the results. Set it to 30 minutes for quick syncs or 90–120 minutes for planning sessions.
Is my schedule data private?
Calculations run locally. Shared links contain the setup in their URL, visible to recipients and services that handle URLs. Website analytics and advertising are described in the privacy policy.
Can I export the overlap results?
Yes. Each identified overlap window has an "Export CSV" button that downloads a CSV file with the start and end time in each participant's local timezone. You can also use the "Copy" button to paste times as plain text into an email or calendar invite.