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World Clock

28 zones, every second, drawn from your OS's IANA tzdata.

The clocks below update every second using the browser’s built-in IANA timezone database. No bundled tzdata, no stale offsets, no manual DST adjustments — when your operating system updates its time-zone rules (which happens several times a year), this page picks up the change on the next reload.

Loading clocks…

How to use

  1. Pick a zone for reference

    The clocks display in a grid — there's no 'home' setting. Treat any of them as your reference and read the others relative to it.

  2. Check the UTC offset

    Each card shows the current UTC offset in the corner. That offset already accounts for DST, so a city's value changes twice a year.

  3. Convert a specific time

    For one-off conversions of a future or past time, use the dedicated timezone converter — this page only shows 'now'.

Frequently asked questions

Why don't I see my city?
The curated list of 28 covers the most-searched zones. If you need a city we don't show, file a request via the contact page and we'll add it.
Is the time precise to the second?
Yes — within whatever drift your machine's clock has from NTP. If your laptop is on Wi-Fi and syncs via the OS, drift is sub-second; if you're offline for hours, drift grows.
Does the page work offline?
Loads from cache, but the clock will freeze at the moment the page lost connection. The Date object the JavaScript reads still ticks; the timezone data is bundled with the OS so the offsets stay correct.

About

Why this matters more than it used to

Remote work made cross-timezone awareness everyday. A team spanning San Francisco, London, Istanbul, and Tokyo crosses ten timezone boundaries every working day. A glanceable world clock removes one tiny source of decision friction.

Coming soon

City-pair pages (e.g. /datetime/new-york-to-london-time/) for direct programmatic SEO targeting, and a meeting-planner mode that shades the overlap of business hours across N cities.