I have hundreds of photos on my HD.
I dump them in my photo folder.
STOP !
See the light NOW ! Before your photo collection grows by hundreds or thousands more !
Get a decent photo management (or DAM ... Digital Asset Management) program. Now !
Lightroom,Media Pro, iPhoto,Aperture,acdsee,cumulus,extensis portfolio .... hell even Picassa.... any half decent program is better than just dumping photos in folders !
Not only will they let you filter and file by date, but you an also keyword and give ratings to your photo collection.
Believe me, once you've discovered it, you'll never go back ! And certainly don't waste your time with scripts unless you are an experienced coder, otherwise you'll have more bugs than Tracy Emin's bed !
Personally I'm a fan of Lightroom for photo management in non-team/non-company environments (not so much for editing where Photoshop rules the nest)....the Lightroom database functionality is some of the best I've seen (especially at that low price point). But pick whatever suits you, most of them offer free trials.
Of course, if organising by date is all you really want to do, then even Flickr will probably do that for you !