Hi Life,
It's not that bad, really -- and it's only for your convenience here on the forums, to show in your own local time when postings were made so you can easily see how recent they are.
I couldn't remember what the forum's default "base" time is, so I had to go back and check my profile. I'm in Eastern Daylight Time and my adjustment is -4, so forum "standard time" must be the same as UT, formerly Greenwich Time.
If I remember correctly, the Alwil team (in the Czech Republic) are +2, so I believe +4 should be the correct setting for you.
As for the display format, if you leave that blank then I believe it uses the "native" format of whatever country/language your version of Windows is. If you prefer a different format just here in the forums, you can enter a different coding in that line DavidR referred to.
Or if you want to change the time-display format generally for your computer, you can do that in the Control Panel, Regional and Language Settings.
Best,
Mike
P.S. I must have misread your postings, thought you said you were 2 hours ahead of the Czech Republic. But if you're 2 hours ahead of "forum time" before you touch anything, then the others are correct and your adjustment should be +2.