dm-timestamps DataMapper plugin which adds "magic" to created_at, created_on, et cetera. Using This plugin works by looking for the "created_at," "updated_at," "created_on" and "updated_on" properties. If they exist, it does the right thing by setting them or updating them. The *at properties should be of type DateTime, while the *on properties should be of type Date. Alternatively, you can have a