Why is there a expiration date on ice-cream?

Question: Why is there a expiration date on ice-cream?
- Keywords:
  expiration date,
  food,
  ice cream
Asked by The Milky Bar Kid MINUS to Andy, Dwaine, Natt, Priya, Tatiana on 17 Jun 2015.
- Tatiana Trantidou answered on 17 Jun 2015:
  
  Ice-cream, just like many other milk products, are very rich in proteins and are also full of water. Bacteria live happily in this environment. Freezing ice cream slows down bacterial growth but doesn’t actually kill the bacteria, which begin to grow again as ice cream becomes liquid/soft (when you have opened it and used it). This is the main reason why old ice cream can make you sick.

Question: Why is there a expiration date on ice-cream?