Hi atom,
This is easy to do, but you didn't mention what files you wanted to save, so I can't provide a specific solution. For example, do you want to rename all files in a given folder? All documents open in Word? Or perhaps just the currently active workbook in Excel? Anyway, whatever it is can be easily done.
To access the creation date of any office document, just use the BuiltinDocumentProperties Property. For example, to save the currently active Excel workbook named by its date:
d = BuiltinDocumentProperties("Creation Date")
ThisWorkbook.SaveAs Format(d,"mmddyy")
Happy computing.
Damon