I am also seeing this as I discovered it when I realized that my mail accounts as well as complaints from clients have notified me that since Monday all of a sudden the incoming spam has increased by enormous amounts, I wonder if that is related

The "Time of Removal" column on the Virus Quarantine tab shows the date/time the message is to be deleted from quarantine. Therefore, it *would* show 30 days in the future. (If that's what you have set in Settings --> Antivirus on the Options card.) The Date column shows the actual date/time that the message was caught.