I'm having trouble recovering content that contain Date fields. All of the content looks exactly the same when I recover it, but upon publishing the date would reset and default to Dec 31, 1969. Is this a bug or a problem on my end?

I'm using the latest version of the Date module (7.x-2.8)

Steps to produce error:
1) Create any content with a date field
2) Enter anything necessary for that content (title, body, summary, date, etc.)
3) Wait for Autosave feature to indicate that content was autosave
4) Close browser and go back to create the content
5) Restore the content and publish
6) The page prints out Notice: Undefined index: in preprocess_node() and the date is reset to Dec 31, 1969