[lbutlr]

The date header contains the date the book was added to the library. I would like to change this to the date the underling ebook was created )or failing that, copy the publishing date to the date) since after re-creating my library every book has the same date.

I have command line and scripting skills, and I'm willing to get into the sqlite3 database if that's the only answer, but if there is a better way, I'd rather do that, but while pubdate is editable in Calibre advanced edit, it appears that "Date" is not.

(The reason is that some other tools that integrate with calibre use the date instead of the published date for sorting and classifying "new" books).