The problem: I've just downloaded about 400+ expense reports from our online reporting system (weekly reports + special ones, for the last 7 or so years). They are PDF files with the report date as the name, e.g., "1-15-03.pdf", "1-15-04.pdf", "1-15-05.pdf", etc.

I want to rename these in the form of "2009-07-31.pdf" before I start the arduous process of examining them for a few things (we have a compensation issue at play). This way, I can handle them chronologically.

Sorting the directory by date is of no value, as they all downloaded with today's date.

Using Windows or DOS to rename will take me hours, and I'm about to fall asleep thinking about it. Are there any quickie file manager utilities or other methods that would help?