While it looks like this will work, it will take a lot longer than Corion's. Also, you should use < code> tags instead of < pre> tags
It would be faster to do a readdir and weed out the files outside the range. Doing a file test for every possibilty can be a bit disk intensive. Crossing the century boundry isn't much of a problem since the file range format is done so that the file for Dec 20, 1999 is less than Jan 4, 2001. You method does make sure that non-dates are not listed.
I was wondering if this question could be a homework question, which stops me from doing a full solution. (well, that and I should be working...)