In the wp-admin menu, under forums. The Created date of all my imported forums is %d/%m/%y at %H:%M.
This is the first I’ve seen anything like this. Possibly a bad upload or a plugin conflict?
Any clue how to fix this? New posts are also affected by this..
If posts are being effected as well then it is probably nothing to do with bbpress. I tried, but can’t replicate your problem on any of my own installs.
I would start by deactivating plugins one at a time and checking to see if the problem goes away. If all plugins are deactivated, and it does not work, then try activating the twentyten theme and see if it still happens.
Hope it helps, and hope you understand that all we can do is guess if we can’t replicate the problem on our own installs.