How do I stop this site from checking the time on my PC?

[USerID]

It's Falkon. It's the same on Firefox.
How do they read the time? Is Falkon's telemetry so advanced?

 

[LibreQuest]

It's Falkon. It's the same on Firefox.
How do they read the time? Is Falkon's telemetry so advanced?

You could try disabling javascript in your browser settings. There are also extensions in firefox to block javascript on specific domains.

 

[T-Daemon]

Your location (and ultimately the timezone) is identified from the machines IP address. Try www/tor-browser or a proxy server to circumvent your IP address.