A world clock for meetings across time zones
Planning a call with colleagues in New York, Berlin and Tokyo means doing time-zone arithmetic, and daylight saving time makes it worse, because countries switch on different dates or not at all. A wrong guess means someone joins at 3 a.m.
This world clock shows the current time in the cities you choose, side by side, with their UTC offsets and whether daylight saving time is in effect. Add or remove zones to match your team.
How to use it
- Look at the default zones: UTC, New York, London and Tokyo.
- Add the cities you work with from the list, and remove the ones you do not need.
- Read each zone's time, date and UTC offset; the clocks tick live.
- Check the date as well as the time: across the date line, a colleague may already be in tomorrow.
Example: one moment in four places
26 October 2026, 15:00 UTC
UTC: 15:00:00, Mon, Oct 26, GMT+0 America/New_York: 11:00:00, Mon, Oct 26, GMT-4 (DST) Europe/Berlin: 16:00:00, Mon, Oct 26, GMT+1 Asia/Tokyo: 00:00:00, Tue, Oct 27, GMT+9
Europe left summer time on 25 October 2026, but the United States only does on 1 November, so for one week New York is five hours behind Berlin instead of six.
Daylight saving time does not switch together
The European Union changes clocks on the last Sundays of March and October. The United States and Canada change on the second Sunday of March and the first Sunday of November. Most of Asia, Africa and South America does not use daylight saving time at all, and in the southern hemisphere it runs the other way round. For a few weeks each spring and autumn, the usual difference between two cities is therefore off by an hour.
That is why it pays to check the actual offset on the day of a meeting rather than remembering a fixed difference.
Zone names, not abbreviations
The clock uses IANA time zone names such as Europe/Berlin and America/New_York, the same database your phone and computer use. Abbreviations like CST are ambiguous: they can mean Central Standard Time in North America, China Standard Time or Cuba Standard Time. When you write a meeting time in an email, add the city or UTC offset to avoid confusion.
Tips for scheduling
For teams spread over many zones, find the overlap of normal working hours first and rotate inconvenient slots so the same people are not always up late. Calendar invites store the time in UTC and show each guest their local time, so send an invite rather than a time in plain text.
Questions
Where does the time come from?
From your device's clock and the browser's time-zone data. If your computer clock is wrong, every zone is wrong by the same amount.
Is my location used?
No. The clock only reads your browser's time zone setting and the zones you pick; it does not ask for your location.
What is UTC?
Coordinated Universal Time, the reference all time zones are measured from. It does not change with the seasons, which makes it the safe choice for servers and logs.