rename (clean up) files with dates in them

I'd like to clean up a lot of files I have by giving them better file names.
I'd like to be able to have a file that is now called: "Italy January 2013" to "Italy 2013-01" and the like for various years and months. (Possibly even files with days in their names where "Rome January 13 2013" gets renamed to "Rome 2013-01-13".)
I see a lot of the renaming options but nothing just like this.
I would also be happy to do it straight in the Finder with AppleScript too if anyone has a solution.
Thanks in advance!
I'd like to be able to have a file that is now called: "Italy January 2013" to "Italy 2013-01" and the like for various years and months. (Possibly even files with days in their names where "Rome January 13 2013" gets renamed to "Rome 2013-01-13".)
I see a lot of the renaming options but nothing just like this.
I would also be happy to do it straight in the Finder with AppleScript too if anyone has a solution.
Thanks in advance!