Midori is happy to announce that the Archiving Plugin for Confluence 4.5.0 is generally available at Atlassian Marketplace!
New in this release
The content of all 4 notification emails types (non-viewed pages, expired pages, archived pages, skipped pages) are editable via a web based editor. In previous versions, you could edit the templates by exploding the plugin JAR, but localization, adding your own content is now super easy.
Just add the label "archive-15/12/1" and the page (plus its descendants) will be automatically archived on 1 Dec 2015. It couldn't be more fire-and-forget. Use it carefully, and make sure you don't shoot yourself in the foot.