aceclock Open the clock

Online Clock

A big, accurate digital clock showing the current time and date — free, full-screen ready, no download.

This is a simple, accurate online clock: it reads your device's time and shows the current hour, minute and second in a large, glanceable display, with today's date underneath. Keep it open in a tab as a desk clock, cast it to a screen, or use it full-screen during a presentation or exam.

Always the right time

The clock syncs to your device, which itself keeps time from the network — so as long as your computer or phone's clock is correct, this display is too. Need to time something instead? Use the stopwatch or timer.

Guides about Online Clock

Telling time 24-Hour vs 12-Hour Clock Format: A Clear Guide A clear comparison of 24-hour and 12-hour clock formats, explaining how each works, how to convert between them, and when to choose AM/PM or military time. 6 min read Telling time How to Use a Full-Screen Online Clock (Free, No Install) A complete walkthrough of how to use a free full-screen online clock in your browser, covering setup, going full screen, accuracy, formats, and everyday uses. 6 min read Productivity & focus How to Keep a Clock on Your Second Monitor A practical guide to keeping a live clock on a second monitor or spare screen, covering setup, full-screen mode, stopping the display from dimming, and useful layouts. 6 min read Productivity & focus Using an Online Clock for Better Time Management A practical guide to using a free online clock for better time management, covering time awareness, planning your day in blocks, beating distraction, and staying on schedule. 5 min read Time zones & UTC Time Zones and UTC Explained (Without the Confusion) A clear explanation of time zones and UTC, covering how coordinated universal time works, why offsets exist, daylight saving, and how to coordinate across regions. 6 min read

More aceclock pages

Analog Clock A clean analog clock with hour, minute and second hands. Stopwatch Start, stop and lap a precise stopwatch right in your browser. Countdown Timer Set a countdown timer with an alarm — perfect for cooking, workouts and study.

Frequently asked questions

Is this clock accurate?
It shows your device's current time, which is normally synced to the network — so it's as accurate as your computer or phone's clock.
Does it work full screen?
Yes — press F11 (or your browser's full-screen option) for a big desk or presentation clock.
Do I need to install anything?
No — it runs in your browser on any device, with no download or signup.