[Plugin: EG-Attachments] How to change file date?

How do I change the date stored with an attachment?

I have a few hundred PDFs to display using EG Attachments but they all have the same date (today).

Ideally looking for an easy way for a user to make date changes as necessary… not using SQL editor.

Any tips appreciated.

http://wordpress.org/extend/plugins/eg-attachments/