Find overlapping work hours across timezones free. DST-aware visual timeline, CSV export, shareable links. Perfect for remote teams. No signup required.
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Remote and distributed teams constantly face the challenge of finding a time that works for everyone. Our overlap calculator takes the guesswork out by showing exactly when every team member is online at the same time — accounting for Daylight Saving Time, overnight shifts, and custom schedules.
Find shared working hours across timezones in five simple steps — no account needed.
Pick the date for scheduling. DST is automatically applied per timezone based on the selected date.
Add each person's timezone and working hours in their local time. Overnight shifts across midnight are supported.
Set time resolution (15/30/60 min) and minimum overlap duration to filter out windows that are too short for a meeting.
Click "Find Overlaps" to see a visual timeline and a ranked list of windows where everyone is available simultaneously.
Copy a shareable link to send the configuration to your team, or export any overlap window as a CSV with local times per participant.
The working hours overlap calculator handles the most common remote work and global scheduling challenges.
A team split across San Francisco (PT), New York (ET), and London (GMT) needs a daily standup. Add all three timezones with 9–5 hours and click Find Overlaps to instantly see the shared window — typically early morning Pacific time, just before London's end of day.
Scheduling a call between a European company (CET) and a client in Singapore (SGT) or Mumbai (IST) is notoriously difficult. The calculator shows the exact UTC window that falls within both parties' business hours, ready to export as a CSV for an email invite.
For async-first teams, knowing the overlap window defines when real-time communication is expected. Add all members and set a short minimum overlap (30 min) to find even brief windows for quick syncs without requiring anyone to work outside their normal hours.
When clocks change in the US but not yet in Europe (or vice versa), overlap windows shift by an hour. By selecting the specific transition date, the calculator automatically accounts for DST per timezone and gives you the correct overlap for that day — no manual adjustment needed.
Quick reference for the most frequently searched timezone combinations — based on standard 9am–5pm local hours. Use the calculator above to check any specific date or custom schedule.
GMT / IST (UTC+5:30)
Winter: 9:00–11:30 UTC (9am–11:30am London | 2:30pm–5pm India). Rises to ~3.5 h in summer (BST). One of the more workable UK–Asia overlaps.
ET (UTC−5) / GMT
14:00–17:00 UTC (9am–12pm ET | 2pm–5pm London). Consistent year-round as both regions shift DST together in spring and autumn.
CET (UTC+1) / ET (UTC−5)
14:00–16:00 UTC (9am–11am ET | 3pm–5pm Amsterdam/Berlin/Paris). Good for a morning standup in the US that catches European teams before end of day.
GMT / SGT·MYT (UTC+8)
Very tight. In winter (GMT) the windows meet exactly at 9:00 UTC with no practical overlap. During BST, around 8:00–9:00 UTC opens ~1 hour. Teams usually need flexible hours on one end.
CET (UTC+1) / JST (UTC+9)
Minimal overlap. Standard windows meet at exactly 8:00 UTC with no margin. In summer (CEST) there is roughly 1 hour (7:00–8:00 UTC). Async collaboration is usually the practical solution.
PT (UTC−8) / IST (UTC+5:30)
No overlap with standard 9–5 hours. PT works 17:00–01:00 UTC; India works 03:30–11:30 UTC — these windows do not meet. Indian teams often shift to 12pm–9pm IST to create a 30–60 min window with early-morning PT.
ET (UTC−5) / AEST (UTC+10)
No overlap with standard hours. Brisbane (no DST) works 23:00–7:00 UTC while ET works 14:00–22:00 UTC — a 1-hour gap between them. Early-morning Brisbane or evening ET calls are the typical solution.
ET (UTC−5) / IST (UTC+5:30)
No overlap with standard 9–5 schedules. ET works 14:00–22:00 UTC; India works 03:30–11:30 UTC. Indian teams shifting to 5pm–2am IST (11:30–20:30 UTC) can create an overlap with late-afternoon ET hours.
GMT / PT (UTC−8)
One of the most workable US–Europe combinations. PT works 17:00–01:00 UTC while UK (GMT) works 9:00–17:00 UTC, giving a 0-hour standard overlap — but if the UK team extends to 6pm (18:00 UTC) there is 1 hour. In BST, the UK window shifts to 8:00–16:00 UTC, still meeting PT at 17:00. Custom hours unlock more.
All figures assume standard 9am–5pm local time. DST transitions, public holidays, and flexible hours change the picture — use the calculator above for exact results.
Common questions about finding shared working hours across timezones with our free calculator.
There is no hard limit on participants. The visual timeline and overlap calculation handle all participants simultaneously. The more participants you add, the narrower the overlap windows typically become, showing only the times when everyone is available at once.
Yes. DST is automatically applied based on the date you select. Each timezone has its DST start and end dates configured (US, EU, Australia, New Zealand). Selecting a date during a DST transition correctly shows the adjusted UTC offset for each timezone on that specific day.
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 whose schedules cross midnight UTC.
The timeline shows a 24-hour UTC grid. Each participant row highlights their working hours in purple, with their local time shown 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.
Click "Copy Shareable Link" to generate a URL that encodes your full configuration (date, participants, timezones, working hours). Anyone who opens the link will see the same setup pre-loaded in their browser — no account or install required.
The minimum overlap filter removes windows shorter than the specified duration (default: 60 minutes). This prevents 5-minute windows from cluttering the results. Set it to 30 minutes for quick syncs or 90–120 minutes for longer workshops or planning sessions.
Completely. All calculations run locally in your browser — no data is ever sent to a server. The shareable link encodes your configuration directly in the URL using base64; nothing is stored on our servers or in any database.
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 directly into an email or calendar invite.
With standard 9am–5pm hours, the UK (GMT) and India (IST) share approximately 2.5 hours in winter — 9:00–11:30 UTC, which is 9am–11:30am in London and 2:30pm–5pm in Mumbai or Pune. In summer (UK on BST) the window extends to about 3.5 hours. Use the calculator above to check any specific date, including DST transition days.
Manchester (GMT/BST) and Pune (IST, UTC+5:30) have the same overlap as the general UK–India pair: roughly 2.5 hours in winter (9:00–11:30 UTC) and up to 3.5 hours in summer. The overlap window falls in the morning for Manchester and late afternoon for Pune, which is the most common pattern for UK–India remote team standups.
With standard 9am–5pm hours, there is effectively no overlap. Pacific Time (UTC−8) runs 17:00–01:00 UTC and India (IST, UTC+5:30) runs 03:30–11:30 UTC — these windows do not meet. Many India-based teams shift their hours to 12pm–9pm IST (06:30–15:30 UTC) to create a 30–60 minute window with early morning Pacific time. Set your custom hours in the calculator to find your actual overlap.
It depends on which US time zone. UK (GMT) and US Eastern Time share about 3 hours (14:00–17:00 UTC — 9am–12pm ET and 2pm–5pm London). UK and US Central Time share about 2 hours. UK and US Pacific Time have no standard overlap — PT starts at 17:00 UTC, just as London closes. Use the calculator to compare any combination.
Standard 9am–5pm hours leave virtually no overlap between US and Australian time zones. Eastern Australia (AEST, UTC+10) works 23:00–7:00 UTC while US Eastern Time works 14:00–22:00 UTC — a gap of one hour separates them. Early morning calls in Australia (7am–9am AEST) or late-evening calls in the US are the typical workaround. The calculator can show the exact window for any combination of adjusted hours.
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