Well that's a very interesting question.  AIUI a Windows machine does not really have a timezone of it's own.  Internally it does all it's date/time stuff in UTC - essentially GMT.  Then before anything gets displayed in the UI it converts to wherever your account settings (in control panel) claim you are.  So if your admin's account claims he is in the UK on GMT; AND the portal claims it's in the UK on GMT; AND the user account you are accessing it with claims it's in the UK on GMT then I'd expect the postings to show up matching my (UK GMT) clock-on-the-wall time.  Not yours because I think you said you were one hour adrift from GMT.

Now that seems to be not event close because I think you said you were seven hours adrift?  Maybe you should check what your sys admin's account is using as a timezone.

It looks like there is something odd about times on this DNN site forum.  My post above is credited as 4:44 or therabouts (presumably pm) but the real clock-on-the-wall time is an hour earlier at 15:44.

I am in germany, and it worked well by me.  I have set the culture="de-DE" and uiculture="de-DE" in the web.config.  Then I have setting the Portal Time zone to german.

Now the Forum saves the time of posts to database with the TimeZone settings from the Portal and user settings. And it is running well.

I am not 100% sure but I think it is working else: