World Clock
Track the current time in eight preset cities side by side, and add more cities from a drop-down.
How to use it
- Open the page and the eight preset city clocks start ticking immediately.
- Each card shows the city name, its IANA zone id, the current local time, the local date and the UTC offset.
- To watch another city, pick it from the More cities drop-down and press Add city.
- Remove a city with the remove button on its card; removed cities return to the drop-down list.
- The clocks refresh every second while the tab stays open.
Common use cases
- Remote teams: one glance at teammates' local times before pinging them.
- Trading and markets: UTC alongside New York, London and Tokyo sessions.
- Family abroad: a private board of the cities you actually call.
- Travel planning: checking arrival-city time against your home clock.
Why it stays private
Times are rendered from your device's own clock and the browser built-in IANA time zone data via the Intl API: no requests, no geolocation, nothing stored. Daylight saving is whatever your browser's zone rules say for each city.
FAQ
Q: Does the clock keep running in a background tab? A: The one-second refresh continues, but browsers may throttle background timers, so a backgrounded tab can update less often. Bring the tab forward for a live display.
Q: Why does the city list differ slightly on other devices? A: The extra cities come from the browser's IANA database, which can vary a little with browser and OS versions. The eight preset cities are fixed.
Q: Can I reorder the cities? A: Not currently. Cities appear in the order they were added; remove and re-add them to get your preferred arrangement.
Your data stays on this device
World Clock runs 100% locally. Everything you paste or drop is processed by your own browser and never transmitted. Nothing is stored on our servers — close the tab and it is gone.
Nothing you type is sent to a server, logged, or used for analytics. The page works even with your network disconnected after first load.