Changing date a very handy feature, especially in a publishing environment, as kimber89 mentioned, when preparation of pics is done in the private Gallery, and when they are moved to the public arena the timestamp is changed to bring them up to most recent upload.
I have a mod on my vb
that makes timestamp and change of username of posts possible ... Advanced Editing Options For Mods & Admins
PhotoPost already has username change capabilities ... just need time stamp feature.
Kimber, how about posting this request in the Suggestion Forum?
... unless Michael tells us that for a technical reason it is not possible ...