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The user time zone selections are labelled as specific time zones relative to GMT: GMT, GMT+1, GMT-1, etc. But the value selected is apparently used as an offset to the server's time, not to GMT.
So if the server is running on GMT-8, and I want to see topic/post times displayed in GMT-5, then I would need to select the zone GMT+3 (which is confusing).
I think it would be clearer to replace the time zone selection menu with a text box for entering a numerical offset.