Fullscreen Clock
A big, always-accurate clock — digital or analog — you can throw on any screen: a second monitor, a kitchen tablet, or a TV in a lobby. Pick a zone, hit fullscreen, and it keeps ticking with correct daylight saving handling.
Unlike a screensaver or a static clock widget, this clock is computed live from your device's clock and the IANA time zone database, so it stays correct through daylight saving transitions without any manual adjustment. Leave the tab open in fullscreen on a spare monitor, tablet, or TV and it keeps ticking accurately for as long as the screen stays on.
Clock change guides
- What Is Daylight Saving Time (DST)? A Plain-English GuideWhat daylight saving time is, how it works in the UK, Europe and the US, why it exists, its history, who uses it and the argument over scrapping it.
- Why Do the Clocks Go Back in October? The Real ReasonThe clocks go back in autumn to return the UK to GMT, so winter mornings are lighter. The history, the rule, what time it happens and what changes for you.
- When Do the Clocks Go Forward Again After Going Back?When the UK clocks go forward again after the autumn change, how long the UK stays on GMT, when evenings get lighter and how to remember to reset your clocks.
Frequently asked questions
Does the fullscreen clock keep my screen from sleeping?
Yes — where supported, it requests a screen wake lock while in fullscreen mode so the display won't dim or lock automatically.
Can I show a different city or time zone in fullscreen?
Yes, use the zone selector below the clock to switch between the UK and a range of popular world cities.
Can I switch between digital and analog?
Yes — use the mode button below the clock. The digital view can also switch between 12-hour and 24-hour format, and seconds can be shown or hidden in either mode. Your choice is remembered on this device.
Does this work on a TV, tablet, or digital signage display?
Yes — any device with a modern browser can open this page and go fullscreen, making it a simple free digital signage clock.