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- Pick two time zones, a date and each side's work hours.
- The tool shows the hours when both people are at work.
- Daylight saving is included, so the answer depends on the date.
- If there is no overlap, it shows how far apart the work days are.
How to use the meeting overlap calculator
Pick the date
Choose the meeting date, because clocks change on different days in different countries.
Choose both time zones
Select your time zone and the other person’s.
Enter work hours
Set the start and end of each work day.
Read the window
See the shared hours in your time, their time and UTC.
How meeting overlap is calculated
Each work day is converted to one common clock, UTC, using the real time zone offset for the chosen date. The overlap is the time when both work days are open at once.
Overlap rule
Overlap start = the later of the two start times
Overlap end = the earlier of the two end times
Shared hours = overlap end − overlap start, if the end is later
The tool also checks the neighboring day in the other zone, so work days that cross midnight in UTC are handled.
Meeting overlap examples
Example 1: New York and London in November
Both teams work 9:00 AM to 5:00 PM. On 7 November 2026 the US is on winter time and the UK is on UTC.
- Time difference 5 hours
- Shared hours 3 h
- New York window 9:00 AM – 12:00 PM
- London window 2:00 PM – 5:00 PM
Three hours are shared.
Example 2: the same pair on 20 March
The US has moved to daylight time but the UK has not yet.
- Time difference 4 hours
- Shared hours 4 h
- New York window 9:00 AM – 1:00 PM
- London window 1:00 PM – 5:00 PM
A one hour gap between clock changes gives an extra hour of overlap.
Example 3: India and London in November
Both work 9:00 AM to 5:00 PM.
- Time difference 5.5 hours
- Shared hours 2 h 30 min
- India window 2:30 PM – 5:00 PM
- London window 9:00 AM – 11:30 AM
Half hour offsets are handled correctly.
Example 4: New York and Dhaka in November
Both work 9:00 AM to 5:00 PM.
- Shared hours None
- Gap between work days 3 h
One side needs to start earlier or finish later to meet.
Where a meeting overlap calculator helps
Schedule remote teams
Find a slot that works for both sides.
Plan client calls
Offer times inside the client work day.
Handle clock changes
See how daylight saving shifts the overlap.
Share the burden
Know how many hours each side must stretch.
The US, Europe and other regions change clocks on different days, so the overlap can change for a few weeks each year. Zone offsets come from your browser. Related tools: Working Days Calculator and Week Number Calculator.
Meeting overlap calculator FAQ
How do I find the overlap between two time zones?
Convert both work days to the same clock, then take the later start and the earlier end. The hours between them are shared.
Why does the overlap change during the year?
Daylight saving starts and ends on different dates in different regions, so the time difference can shift by an hour for a few weeks.
What if there is no overlap?
One side must work earlier or later. The tool shows how many hours apart the work days are.
Does it handle half hour time zones?
Yes. India, for example, is 5 hours 30 minutes ahead of UTC and the calculator keeps the half hour.
Can I use different work hours for each side?
Yes. Set the start and end for each side separately.
Which time zones are included?
Common zones across the Americas, Europe, Africa, Asia and Oceania. More can be added later.