To adjust the forum to show times correctly, go into your profile (click the "Profile" link up in the header), scroll down to "Timezone", and:
Vic & NSW: Set to "GMT+11"
Qld: Leave on "GMT+10"
SA: hmmm, GMT + 11.5 doesn't seem to be an option. I'll look into this.
NT: Leave on "GMT+10.5"
WA: Set to "GMT+8"