About
A clock you can actually trust.
Real World Clock started from a small annoyance: every "world clock" on the web either buries the time under ads, trusts a device clock that's quietly wrong, or makes you sign in to save a couple of cities. We wanted the opposite — open a tab, see the real time across the places you care about, and get on with your day.
Right to the second.
Most clocks just echo your device clock — which drifts. We sample an authoritative UTC time source, correct for network latency, and show you the real time plus how far your own device has drifted.
No ads, ever.
No banners, no interstitials, no tracking pixels. The page you load is the page you wanted. We'd rather be the clean tab you keep open all day than the one you close.
No account, no friction.
Your places, theme, and 12/24-hour preference live in your browser — not on our servers. Open the site and it's just there. Share a board with a link, no sign-up required.
Honest about time zones.
Offsets and daylight-saving transitions come straight from the IANA time-zone database built into your browser — the same data operating systems use. A city is never an hour off after a clock change.
What's in the box
A comparison board for watching many cities at once, a drag-to-find meeting planner for lining up a time that works across zones, a quick time-zone converter, and a transparent accuracy page that shows the live drift of your own device versus real time. Everything runs in your browser and works without an account.
Questions, ideas, or a city we're missing? Email hello@realworldclock.com.