Status
● Tab visible: —
● Online: —
● Device timezone: —
● Browser locale: —
● Reduced motion: —
● Offline support: —
Time Tools
Clock Health Check
Check browser visibility, connectivity, timezone support, and clock resync status in one place.
Live display
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Why this matters
Browsers may pause background tabs to save battery. TimeWithSeconds automatically resyncs on focus, visibility changes, online status, and page restore.
What clock health checks
The status panel helps confirm that the tab is visible, the browser is online when needed, timezone support is available, and the display loop has resynchronized after sleep or throttling.
When to use it
Use this page after waking a laptop, returning to an old tab, switching time zones, or before a timing-sensitive session where you want confidence that the display loop is active.
Frequently asked questions
What does clock health check?
It checks browser visibility, online status, time zone, locale, reduced motion preference, and service worker support.
Does it check atomic time?
No. It checks the browser display environment. Network accuracy checks require a separate time endpoint.
Why is this useful?
It helps confirm that the clock page is active, visible, and running in the expected browser environment.