On the edit details form you should replace the Time-Offset input field with a select menu, and on that menu have the names of places in that Time-Zone listed. It was a bloody trial and error method for me to get my timezone worked out correctly with this forum. Is the time off-set here based off the server's location as opposed to GMT?

Offset: 11 hours (Sydney, Melbourne, Canberra) etc would be good to have on the select menu. Having it based off GMT time would be good.
Cheers,
Michael Bray