Incorrect creation and modification dates after importing documents from xar

I've used
http://extensions.xwiki.org/xwiki/bin/view/Extension/Large+XAR+Import
snippet and
http://extensions.xwiki.org/xwiki/bin/view/Extension/XWiki+Platform+-+WikiStream+-+UI
application to migrate XWiki to the new server.
In both cases they show incorrect document creation and last change dates.
E.g.:

Last modified by Administrator on 2011-06-06 17:12
Created by User on 2014-07-21 10:11

but it should be vice versa:

Last modified by Administrator on 2014-07-21 10:11
Created by User on 2011-06-06 17:12

History table shows following:
1.1 Administrator 2011-06-06 17:12 Imported from XAR Current version

Which is also misleading, because if XAR import is noted in history, it
should show last modification date (2014-07-21 10:11), not creation date
(2011-06-06 17:12).

I can register new bug if my thoughts seems reasonable, but I'm more
interested in workaround how to "fix" it in the way.

Thanks!
Valdis