The default forum time is for Sydney, Australia - and since that's where Dave is, it makes sense.
You can vary your offset by navigating to your profile settings "Look and feel" and put a number of hours in the field provided. As you can see, you can put in negative and decimal values. You can also try clicking on "auto detect" to see if it comes up with the right value for you.
Don't forget to click on the
Change Profile button down the bottom of the page or your changes won't be saved!!
I'm not sure what happens with daylight savings changes - but if you end up out of whack, it's just a matter of changing the offset twice a year....