Online clock

A large, readable clock for the current time — useful on a second monitor, a spare tablet, a kitchen screen, or behind you on a stream. Full-screen mode strips everything else away.

The time comes from your own device, so it matches the clock in your menu bar. Alongside it you get the details that are usually a search away: your time zone and UTC offset, the ISO week number, the day of the year, and the current Unix timestamp.

Options

• Switch between 24-hour and 12-hour display. Your preference is remembered.
• Show or hide seconds. Hiding them makes the clock calmer to have in peripheral vision.
• Full screen hides the surrounding page — including the ads and links — and shows nothing but the time and date.

Where the time comes from

This page reads your device's clock and time zone. It does not query a time server, so if your computer's clock is wrong, this clock is wrong in exactly the same way. Every modern operating system syncs over NTP by default and is typically accurate to well under a second, but if the displayed time looks off, the fix is in your system date and time settings rather than here.

That also makes it unsuitable as a reference for anything where being a second out matters — timestamping, competitive events, auction snipes. For those, use a dedicated NTP-backed source.

The extra readouts

• Time zone and offset: your IANA zone name, such as Europe/Istanbul, with the current UTC offset. The offset changes across daylight saving transitions; the zone name does not.
• ISO week: the ISO 8601 week number, where weeks start on Monday and week 1 contains the first Thursday of the year. Common in European business and manufacturing calendars.
• Day of year: 1 to 365, or 366 in a leap year.
• Unix time: seconds elapsed since 1 January 1970 UTC. The lingua franca of timestamps in software.

Frequently asked questions

Is this clock accurate?

It is exactly as accurate as your device's clock, which it reads directly. Modern systems sync automatically over NTP and are usually within a fraction of a second. It does not correct for a wrong system clock.

Can I use it as a full-screen clock?

Yes. Press Full screen to hide everything but the time and date. Combine it with your browser's own full-screen mode for a display with no browser chrome at all.

How do I switch to a 12-hour clock?

Press the 24-hour button to toggle to 12-hour with AM and PM. The choice is saved in your browser for next time.

What time zone does it use?

Your device's own zone, shown under the clock with its current UTC offset. To see other cities at the same time, use the world clock.

What is Unix time for?

It is a single integer counting seconds since 1 January 1970 UTC, used throughout software because it is unambiguous — no time zones, no formats. Handy when reading logs or debugging an API.