Tracking unsubscribers

Is there an easy way to see when someone unsubscribed? Then I can tell if yesterday’s newsletter was offensive or unpalatable and try to do better tomorrow. I know how to filter members by Subscribed/Unsubscribed/Email Disabled. I can filter by Last Seen. But I don’t see a way to filter by “Unsubscribed Date < two days ago.” Incidentally, it’s interesting how many people who Unsubscribed months ago were Last Seen yesterday.