World Clock, See Time in Multiple Cities at Once
This world clock shows the current time in as many cities as you add, updating live every second, with a built in meeting time converter so you can find a time that works across every timezone. Add and remove cities freely, no sign up needed.
How the World Clock Works
This world clock uses your browser’s built in Intl API to read live time zone data directly from your operating system, the same data source used by your phone and computer’s own clock. Add any city and the tool displays its current local time, updating every second, along with its UTC offset and whether it is currently day or night there.
Because it relies on the IANA time zone database built into every modern browser, daylight saving time is handled automatically and correctly for every region, including places that do not observe it. Your saved list of cities is remembered in your browser between visits, so you do not need to re-add your regular contacts or offices each time.
The meeting time converter lets you pick any date and time in one of your added cities and instantly see the equivalent local time in every other city on your list, useful for scheduling calls across time zones without doing the math by hand.
What This Tool Does
How to Use It
Add cities
Pick a city from the dropdown and click Add Clock, repeat for every location you need to track.
Watch them update
Every clock updates live, once per second, with the day or night background telling you at a glance whether it’s a good time to call.
Plan a meeting
Use the Meeting Time Converter to pick a specific date and time in one city and see it converted for every other city.
Remove as needed
Click the small × on any clock card to remove it, your remaining list saves automatically.
Why Time Zones Aren’t Just Simple Offsets
Daylight saving shifts
Many regions move their clocks forward or back once or twice a year, which changes their UTC offset for part of the year but not all of it.
Half-hour and 45-minute zones
Not every time zone sits on a clean hour boundary, India, Iran, and parts of Australia use 30 or 45 minute offsets from UTC.
Political changes
Countries occasionally change their official time zone rules entirely, which is why relying on live, maintained time zone data matters more than a fixed offset table.
FAQ: World Clock
It is as accurate as your device’s own system clock, since the tool reads the time directly from your computer or phone and applies the correct time zone offset using your browser’s built in time zone database. As long as your device’s clock is set correctly, typically via automatic network time sync, every city shown here will be accurate to the second.
Yes. Every city’s time is calculated using the IANA time zone database, which is maintained to reflect exactly when each region shifts its clocks forward or back, including regions that don’t observe daylight saving at all. You never need to manually adjust for it, the clock updates automatically on the correct date each year.
There is no fixed limit, add as many cities as you need for your team, family, or clients. Each one runs an independent, live updating clock in your browser. For very large lists, more cities will naturally take up more screen space, but there is no technical restriction on the count.
Yes, your list of added cities is saved locally in your browser’s storage, so it will still be there the next time you open this page on the same browser and device. Clearing your browser data, or switching to a different browser or device, will reset the list back to the default suggestions.
Pick a reference city from your added list, enter a date and time, and the converter instantly shows what that exact moment looks like in local time for every other city you’ve added. This is useful for scheduling a call and immediately seeing whether, say, 9am in New York falls at a reasonable hour for colleagues in London and Tokyo, without doing time zone math manually.
Many cities share the exact same time zone even though they are geographically far apart, for example most of the eastern United States and Canada share Eastern Time, and much of Western Europe shares Central European Time. This is expected and reflects how time zones are drawn around regions and countries rather than individual cities.
Each clock card switches to a lighter background with a sun icon between 6am and 6pm local time in that city, and a darker background with a moon icon outside those hours. It’s a quick visual cue for whether it’s a reasonable time to call or message someone in that location, without having to read the exact hour first.
No. The tool reads your device’s local time zone setting only to suggest a default “Your Location” clock, it does not request GPS location, IP based location, or any other tracking data. Your saved city list stays in your browser’s local storage and is never transmitted anywhere.