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Quick Answer. Diet Coke lasts for six to nine months past its printed date in the pantry if unopened. The soft drink lasts for the same amount of time if refrigerated and unopened.
Heinz has a best by date of 15 months printed on its ketchup, if I recall correctly, but that is not the same as true expiration. That's just when the flavour/quality may begin to change. It will remain viable for quite a while after that. An unopened bottle probably just won't expire.