Clock Test

A free time-sync check for browsers. Compares this computer's clock against a trusted edge time source and tells you if it is off enough to break HTTPS certificate validation, domain logins, or time-based 2FA. Useful when a login "just started failing" for no obvious reason.

Read the Clock Test guide for help interpreting the verdict.

Privacy: The test contacts only edge.desktest.net (a Cloudflare Worker that stores nothing) to read trusted edge time; your clock reading stays in the browser. No credentials, no business data, no telemetry to us. View source to confirm. No analytics, no tracking.

Configuration

Driver: Trusted edge time (NTP-lite)

Takes a few seconds. The test reads trusted time from a single Cloudflare Worker several times to measure your clock offset; no business data is sent.

Status Check Step

Pending

Reach the time source

Fetches trusted edge time from edge.desktest.net/time to confirm it answers.

1 of 3

Pending

Measure your clock offset

Takes five timed round-trips and keeps the fastest to estimate how far this clock is off.

2 of 3

Pending

Is the clock usable?

Checks the measured offset against the thresholds that break 2FA, HTTPS, and domain logins.

3 of 3