How can I tell if the product I just purchased is still fresh? What does the manufacture code printed on a package mean?

We label our products with a Better If Used By date on the outside of the package. Our product should be used by this date to ensure the best taste and texture. The product is still safe to eat after this date but the quality of the food may decline.
Examples of how a Better If Used By date of August 12, 2016 may appear on package:  
AUG 12 2016 KX

AUG1216 KX

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