Sorry to hijack this old thread but google brought me here after I found an issue with timestamping of "Save as..." files.
If I save a file as a JPG from a PDN, it seems to inherit the metadata of the original file and leaves me with a file created (in this case) 4 days ago. If I save as PNG, I get a file created "now".
(note if I save the PDN first, then Save As... JPG it seems to work)
Minor issue but it was a headscratcher when I was trying to find the file I'd just created.....