Attachments Last Modified Date

c.average-gmail
So I am trying to display a last modified date of each attachment on a document. I have the attachments displaying through a "Document Attachment" web-part and everything works fine. I have the name displaying, and it seems that I'm able to get every other column from the attachment table for each document type.

However, when I put in "Eval("AttachmentLastModified")" it returns nothing. Nothing shows up at all. It's really frustrating, because that seems to be the only field that I can't get to show up.

Any help will be greatly appreciated. Also we know for a fact that the field in the database is not empty.

Thanks in advance.