Time Zone Meeting Planner
Pick the cities, set each working day, and see the hours that actually overlap.
Overlapping hours
No hours overlap on this date. Widen the working hours, or pick a different pairing.
How to use
- Add the cities you need. Any IANA time zone id works if your city is not in the list.
- Set each side’s working hours — they do not have to match.
- Pick the date. The overlap is listed in every city’s local clock, with a mark when the date differs there.
Examples
Seoul and New York, 09:00–18:00
There is no overlap at all — Seoul’s working day ends before New York’s begins. The tool says so instead of offering a time that only works for one side.
Seoul and Berlin
On a date in October the window is 16:00–18:00 in Seoul, which is 09:00–11:00 in Berlin. Two hours, at the end of one day and the start of the other.
Widening the hours until something opens
With Seoul at 07:00–23:00 and New York at 08:00–20:00 two windows appear: Seoul 07:00–09:00 (the previous evening in New York) and Seoul 21:00–23:00 (that morning in New York).
A day the clocks change
Pick 1 November 2026 with New York in the list: the offset changes during the day, and the notice says what it moved from and to so the invitation is not an hour out.
FAQ
Is anything sent to a server?
No. The time zone data is already in your browser and the whole calculation runs there. The cities you picked are remembered in this browser only; Reset clears them.
How is daylight saving handled?
Each zone’s offset is read at the exact moment being tested, so a window spanning a change is still correct. When the chosen date is a change day, a notice shows the offset before and after — check the transition hour before sending an invitation.
Can each city have different working hours?
Yes. Every row has its own start and end, so 09:00–18:00 on one side and 08:00–16:00 on the other work as you would expect.
How do I pick the right IANA id?
Choose the city from the list, or type any id your browser knows, such as Asia/Seoul or America/New_York. The id and the current offset are shown next to each row.
How is this different from a timestamp converter?
That one turns a single instant into a number and back. This one compares working days across places and finds where they overlap. Unix Timestamp Converter
Does it know about public holidays?
No. It only compares clock hours — a window may well land on a holiday or a weekend in one of the cities. Korean Holidays