Exact Time Clock
A clock that syncs with an internet time server instead of trusting your device, then shows the time to the millisecond along with how far off your own clock is.
🔒 Runs in your browser. Nothing is uploaded.
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Syncing with the server…
How to use
- Open the page. The clock syncs with the server automatically within a few seconds.
- Read the accuracy next to the green dot, and how fast or slow your device clock is.
- Switch between 12- and 24-hour time, or hide the milliseconds.
- Press "Full screen" to use it as a big desk or wall clock.
Examples
Ticket and course sign-ups
Watch the seconds tick toward the opening time so you can click at the right moment.
Check your computer clock
Find out whether your PC or phone clock drifts, and by how much.
Broadcasts and live events
Keep a full-screen reference clock on a second monitor during a stream or event.
Frequently asked questions
How accurate is it?
Usually within a few tens of milliseconds. The clock measures the network delay to the server several times and shows the remaining uncertainty as "±… ms".
Which server does it sync with?
The Cloudflare server that delivers this site, whose clock is kept on standard time (UTC) through NTP. Your files or personal data are not involved; only the current time is requested.
Is this the same as a ticket site's server time?
Not exactly. It shows standard time. A ticketing or booking site may run its own server clock that is slightly ahead or behind, so treat it as a close reference.
Why is my device clock off?
Device clocks drift and only correct themselves from time to time. Turning on automatic time sync in your system settings fixes most of it.