If you are running Lion 10.7 or Mountain Lion 10.8 and maybe Snow Leopard 10.6 you can press ⌘J and then go and "Sort By' and then choose 'Date Added' and that will sort that Finder Window by Today, Previous 7 Days, Previous 30 Days and then Earlier, but not so much by Months and Years.
There probably is a 3rd Party App that could do this, but i havnt heard of one . .
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