Compare Time Zones and Plan Meetings Across the World
Add up to 10 cities, see their local times side by side, and find a meeting time that works for everyone — no time zone math required.
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Click the button above to add timezones you want to compare
How to read a time difference
The tool above compares whoever you add, live. A city-pair page answers a narrower question: what time it is there when it is a given time here, and which hours fall inside a 9-to-6 day on both sides. The big number on that page is not "the" difference. It is the gap for one part of the year. If either city changes its clocks, another part of the year is a different number of minutes.
The live clocks are the current civil time. The schedule under them lists every stretch of the year when the gap changes. Check that schedule before you save a recurring invite. New York and London are five hours apart for most of the year and four hours apart in the weeks when the United States has changed and Europe has not. The dates move. The pattern does not. The guide to those weeks says which side of the invite moves, and when the empty room actually happens.
When there is no good hour
Some pairs never share a 9-to-6. New York and Tokyo. San Francisco and Singapore. New York and Sydney. The tool will still mark a least-bad hour. That hour is a compromise, usually someone's evening, and it should not become a daily standup by default.
Write the decision down at the end of the day that is ending, and let the other city read it at the start of theirs. The handoff note is the format, with the times worked for San Francisco and Singapore in both seasons. A three-city week that does not pretend to have a standup is written out for San Francisco, Berlin, and Singapore.
Where the times come from
Conversions use the IANA time zone database through your browser. The site does not keep a private offset table, which is why a half hour in India stays a half hour and a clock change shows up when your browser's data includes it. Chunyang maintains the site. The about page says what that does and does not mean. The meeting grid assumes 9:00 to 18:00. Offices that do not keep those hours will not match the green rows.
Start with a guide, then a corridor
Most city-pair URLs are calculators: clocks, a working-hours grid, and the year's offset table. A smaller set has a written note about how that corridor gets scheduled, including the holiday or the clock rule the grid cannot see. If you are booking one of these, start there.
- London and New York: the overlap is London's afternoon, and it shrinks to four hours in the mismatch weeks.
- London and San Francisco: two hours at the end of London's day, and the mismatch weeks are the kinder ones.
- San Francisco and Singapore: no shared workday. Hand the work over.
- Beijing and Tokyo: one hour, all year. The calendars are the problem.
- London and Mumbai: the half hour is real, and rounding it off makes you early forever.
- New York and Sydney: the date changes under you, and the gap has three settings.
The rest of the written corridors are on the city pairs page, ahead of the full calculator index. Longer guides: which time zone should own the invite, scheduling with India, scheduling with Sydney, same clock, different calendar, and the week the clocks change. Everything sits on the articles index.