Online Clock
A large digital clock with seconds, 12/24-hour switching, the date, and a fullscreen mode for presentations and desks.
How to use it
- The clock reads your device time, so it is always right.
- Toggle between 12- and 24-hour and show or hide seconds.
- Fullscreen turns any spare screen into a desk clock.
A large, always-current digital clock reading straight from your device's system time — no separate time sync needed, since it's exactly as accurate as the clock the device itself keeps.
12-hour vs 24-hour display
The toggle switches between 12-hour format with AM/PM (common in the US) and 24-hour format (common across most of Europe, Asia and in any military or logistics context where AM/PM ambiguity is a real problem — 3:00 in 24-hour is unambiguous, while '3 o'clock' always needs a qualifier).
Fullscreen as a desk or wall clock
On a spare monitor, tablet or old phone propped up somewhere, fullscreen mode turns this into a dedicated clock display — for a desk, a kitchen, a workshop, or a presentation venue where attendees need to track time without checking their own devices.
Last updated 17 August 2026