Find the Best Time to Meet Across Time Zones
Coordinating a call between New York and London — or anywhere else? This free meeting time finder finds the best time to meet across time zones: enter each person's time zone and work hours, pick the meeting date, and it instantly shows the hours where both of you are available, in both local times. Daylight saving time is handled automatically.
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Pick time zones, work hours and a date to see the overlap.
How to use this calculator
Choose Person A's time zone and work hours, then do the same for Person B, and pick the meeting date. The calculator instantly shows the overlap: the stretch of hours that falls inside both people's work windows, displayed in each person's local time so nobody has to convert anything.
If the windows don't overlap at all, the tool says so and tells you exactly how far apart they are — for example, "Person B's window starts 4 hours after Person A's ends" — plus what each person's window looks like in the other person's local time, so you can propose a shift that works for both sides.
Results update the moment you change any input — the Calculate button re-runs the finder at any time. The date defaults to today, but always set it to your actual meeting date, because daylight saving changes the answer.
How it works
Finding an overlap is a two-step conversion. First, each person's local work window is translated into UTC (Coordinated Universal Time). To do that, the tool asks your browser's built-in Intl.DateTimeFormat time zone database: "for this IANA time zone, on this date, what is the UTC offset?" That lookup uses the real, current time zone rules — including daylight saving transitions — for the date you picked.
Concretely: on 2026-09-22, New York is on EDT (UTC−4), so a 9:00 AM–5:00 PM New York window becomes 1:00 PM–9:00 PM UTC. London is on BST (UTC+1), so its 9:00 AM–5:00 PM window becomes 8:00 AM–4:00 PM UTC. Once both windows are in UTC, the overlap is plain interval math: the later of the two starts and the earlier of the two ends. Here that gives 1:00 PM–4:00 PM UTC, which converts back to 9:00 AM–12:00 PM in New York and 2:00–5:00 PM in London.
Why the date matters. Offsets are measured at midday UTC on the date you choose, because a zone's offset can change overnight when clocks spring forward or fall back. Scheduling the "same" meeting in January instead of September can move the answer by an hour or more.
Work windows are treated as full hours. If the end hour is at or before the start hour (for example 20:00 to 08:00), the window is read as overnight, ending the next day. Windows that wrap across midnight are matched against the other window on either day, so night-shift overlaps are found too.
Assumptions and limitations: the calculator assumes both people work the same hours every day — it does not know weekends, holidays, lunch breaks, or variable schedules. All math runs in your browser; nothing you enter is sent anywhere. The offset is measured at midday UTC on your chosen date, so windows scheduled in the exact hour of a DST transition (usually around 2 AM local) may be off by one hour.
Frequently asked questions
Why does the result change when I pick a different date?
Because of daylight saving time. Time zone offsets are not fixed: New York is UTC−5 in winter (EST) and UTC−4 in summer (EDT), and London switches between GMT and BST. The meeting you schedule for September can have a different overlap than the same meeting in January, so always pick the actual meeting date before sharing times.
What if there is no overlap between our work hours?
The calculator will say so and show exactly how far apart the two windows are in hours. The simplest fix is for one side to flex: the tool shows each person's window in the other person's local time, so you can propose shifting one window by the gap shown — often just 1–2 hours — and an overlap appears.
Does the tool handle daylight saving time?
Yes. Offsets are computed from the IANA time zone database for the exact date you pick, so EDT/BST and other daylight saving rules are applied automatically. The only approximation: the offset is measured at midday UTC on your chosen date, so a meeting scheduled in the exact hour a DST transition occurs (usually around 2 AM local time) may be off by one hour.
Does it know about weekends and holidays?
No. The calculator assumes both people work the same hours every day — it does not know weekends, holidays, lunch breaks, or part-time schedules. Use it to find the daily overlap, then confirm the specific day with the other person.