Check your device clock display and resync status, and see what a browser-only clock can and cannot verify.
This static version reads your device time directly. No server is needed, and the clock refresh loop restarts automatically if the browser pauses it.
No server time check in this static build. A future optional Cloudflare Worker can compare your device clock with network time using only a few pings on demand.
A clock page can be left open for hours. This build automatically restarts the update loop when the tab wakes, the device returns from sleep, or the browser throttles animation frames.
This page checks your browser display refresh and device-clock behavior. TimeWithSeconds updates from your device clock and automatically resyncs the display when the tab becomes active again.
For official atomic accuracy, your operating system must be synchronized with network time. A browser-only static page cannot independently prove atomic-clock accuracy without an optional network reference.
It watches the browser clock display, reports when the display was last resynchronized, and lets you restart the display loop manually. It does not claim to measure an atomic clock by itself.
The page reads the clock already maintained by your device. If the operating system is synchronized with network time, the display follows that clock without continuous server requests.
