What happens when you bake with milk/buttermilk that is close to it's expiration date? Does the baking process eliminate the need to concern myself with this date? Does the now baked good have a new shelf life of it's own? What is the normal shelf life of a home baked refrigerated cake? Does freezing a cake/cupcake days after being baked extend the life of the baked good upon defrosting it, and if so, for how long?