Are daylight-saving changes handled?

Yes. Times are computed with your browser built-in IANA time-zone database — the same one your operating system uses — so daylight-saving transitions are applied automatically.

Which time zones can I add?

Any IANA zone your browser knows, listed by region and city (for example America/New_York or Pacific/Auckland). Older browsers fall back to a curated list.

Is any clock data fetched from a server?

No. The current time comes from your device clock and all conversions happen locally — nothing is fetched or sent.

World Clock — Multiple Time Zones

Compare the current time across any IANA time zones, side by side.

See every time zone at once

Add any IANA time zones you care about and watch the live time in each, side by side. Every row shows the UTC offset and the difference versus your own device, so scheduling across regions is instant.

Conversions use your browser’s built-in time-zone database, so daylight-saving transitions are handled for you — and no clock data is ever fetched or uploaded.