Going back to my original thought of a standard offset against the server time it really wouldn't be a guess if the date and time were displayed right above the form box for the offset.
Meaning, if you saw
Current server time is Tuesday, September 27 12:37 PM
Then you could look at your clock and see what offset you need. Trying to deal with GMT and daylight savings would be a cludge at best and still may not work for all timezones. Whereas a simple time offset would be quite simple.
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Scream
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