I tried a scan with different options and no fixing,and it still shows the correct date/time scanned.
I do have Spybot 2.4,which may be the difference.I know that there were some troubles with the Last Update button in the 2.3 version,please see Number Two here:
http://forums.spybot.info/showthread...l=1#post453671
Perhaps there was a problem with the Last Scan button under System Scan in Spybot 2.3,and nobody noticed.
You could either go up to Spybot 2.4 and see if it is fixed for you,or since the button is reporting the wrong scan time,you could choose just to ignore it,whichever you prefer.
http://www.safer-networking.org/dl/
If you decide to go with going up to Spybot 2.4,your best option is to download the Free Edition.When it is installing,you should be prompted if you would like to get a newer license,or keep the one you have.I went with keeping the older license when I upgraded mine.