How to tell the expiration date of Dermalogica products?

it should be printed on the box or n the product itself. Also if you already know the original smell and color of the product you can tell if its gone bad by a change in color or smell.How to tell the expiration date of Dermalogica products?
some of the products have an experation date on them %26amp; some do not...call the dermal institute %26amp; ask them about Ur product...