Time Zone Spoof does not work

[chessgeniusc2]

whoer.net detects accurate time zone and spoof doesn't work.

[chessgeniusc2]

Sites can accurately detect timezone. Here is another example: http://browserspy.dk/date.php

[jpenney]

As far as I can tell, spoofing works if they query the browser, but not if they do a geo-ip lookup to figure out where an IP address is from, then lookup what the local timezone there is.