JavaScript has a way to determine your local system time and date. This could be used for fingerprinting as an attacker can determine the difference in clock skews and offsets from other users and may also be able to determine your location by checking which countries have a similar time as you.
I created a website to test this and it even works with the Tor Browser.
https://madaidan.github.io/index.html
This seems pretty bad and I haven’t seen anyone talking about this. Does anyone else know about this?