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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.
Most soda companies do not actually label their sodas with expiration dates. Rather, they label soda boxes and cans with best by dates. There is an important distinction between best by dates and expiration dates, as an expiration date warns consumers of potential health hazards, and a best by date is meant to inform consumers of potential taste degradation as a result of aging.