Changing PDF file date to internal PDF publishing date?

[Fla$her]

with values from plugin.

You mean plugins suitable for editing, and not xpdfsearch itself, I suppose?

[zeeko]

You can change FS (FAT, NTFS, ...) file properties (e.g. tc.creationdate) with values from xPDFSearch plugin (e.g. xpdfsearch.Created).
No, you can't change content of PDF file with xPDFSearch plugin.