How are the time zones calculated?

The clock uses your browser's built-in IANA time-zone database via the Intl API — the same data your operating system uses. This means daylight-saving transitions are applied automatically and correctly for each city.

How accurate are the times?

The displayed times are as accurate as your device's own clock, ticking once per second. UTC offsets and the difference versus your local zone are computed live, so they update if a city crosses a daylight-saving boundary.

Is any location or clock data sent to a server?

No. Nothing is fetched and no location is shared — all time-zone conversions run locally in your browser using built-in browser data, so the tool works offline and keeps your activity private.

World Clock — Multiple Cities

Multi-city world clock

Keep an eye on the time across the globe with a multi-city world clock. Add the cities you care about and see their live local time and date side by side, each with its UTC offset and how many hours it is ahead of or behind your own device’s time zone.

Pick from major cities across every continent, switch between 24-hour and 12-hour formats, and remove zones you no longer need. It’s ideal for scheduling calls, coordinating remote teams, or tracking markets and family in other countries.

Conversions use your browser’s built-in IANA time-zone database (the same one your operating system uses), so daylight-saving changes are handled automatically. It is privacy-first — no location is shared and no clock data is fetched; everything runs locally.