The date for each content item is selectable, if historical content needs to be entered.
Instructions
Open a piece of content.
In the [Date] field, enter in the date the piece of content was published, even if it's a historical date.
The content will be archived to the appropriate archive folder. i.e. if the content date was 2005, the content would go into the 2005 archive folder, rather than appearing with the latest pieces of content that were created at the same time.