How does this know my local timezone?

Your browser reports its own IANA timezone via a built-in API, and that zone is added automatically the first time you open this tool. You're free to remove it afterward — it's not pinned or treated specially from any other saved location.

Does this stay correct across daylight saving changes?

Yes — each clock is computed live from the current time using that location's real IANA timezone rules, not a fixed UTC offset saved at add-time, so it automatically follows DST transitions the same way the location's local clocks do.

Where are my saved locations stored?

In localStorage, on your device only — not synced anywhere. Clearing your browser data or switching browsers/devices starts you over with just your local timezone.

Does this tool upload my data anywhere?

No. Everything — detecting your timezone, computing each clock, saving your location list — happens entirely in your browser using standard Web APIs. Nothing is sent anywhere.

Utility

World Clock

About World Clock

How does this know my local timezone?: Your browser reports its own IANA timezone via a built-in API, and that zone is added automatically the first time you open this tool. You're free to remove it afterward — it's not pinned or treated specially from any other saved location.
Does this stay correct across daylight saving changes?: Yes — each clock is computed live from the current time using that location's real IANA timezone rules, not a fixed UTC offset saved at add-time, so it automatically follows DST transitions the same way the location's local clocks do.
Where are my saved locations stored?: In localStorage, on your device only — not synced anywhere. Clearing your browser data or switching browsers/devices starts you over with just your local timezone.
Does this tool upload my data anywhere?: No. Everything — detecting your timezone, computing each clock, saving your location list — happens entirely in your browser using standard Web APIs. Nothing is sent anywhere.

Track the current date and time across saved locations, updating live.

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status: idle