Why the timezone gives a proxy away
The IP address tells a site where the request came from; the timezone tells it where the system believes the person is sitting. For a regular user the two agree: a German IP and Europe/Berlin. When a browser set to Europe/Moscow arrives through a German proxy, anti-fraud sees a contradiction that nothing but a proxy can explain. It is one of the cheapest and most reliable checks, and nearly every large platform runs it — from ad accounts to marketplaces.
How to read the verdicts
Ok — the browser timezone matches the IP timezone. Notice — the zones have different names but the same offset (say, Europe/Paris and Europe/Berlin): technically not an error, but a careful anti-fraud system will notice. A browser language unusual for the country lands here too — a soft signal, common among expats and travellers. Exposed — the offset does not match the IP: the session is treated as spoofed. If the geo service is unavailable, the comparison is skipped, while the browser timezone and languages are still shown.
How to align them
Changing the system clock for every proxy is inconvenient and breaks everything else on the machine. An antidetect browser does it inside the profile: it derives the timezone, language and geolocation from the proxy IP so that everything lines up. See which browser to pick in the rating and how to choose proxies for a task in the blog. For the remaining signals, run the full fingerprint check; for address leaks, the WebRTC test.