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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.
There is a caffeine free version of diet coke as well, but this has no extra calories in than the normal version of the diet drink. 1  In a 12 fl oz can of caffeine free diet coke there is just 1 calorie. 2  In 1 fl oz of caffeine free diet coke there are 0 calories.