NamedBlobFile - Modification Date of File


I created a Dexterity content type with some namedblobfields. The user of the site could upload files using this fields. If they created a new version of their files they could replace the current file with their new one. I'm wondering if there is a way to get the modification date of the namedblobfield (the date the file is uploaded) or alternatively the meta-data from the file (it's modification date).
I could only find information about the modification date of the Dexterity content type itself.
Thanks for any hint.

If your field is a primaryfield (marshal:primary="true" ) I would look here for inspiration:

and expect the modification date info to be here: info = IPrimaryFieldInfo(context, None)