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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.
Just to give you a perspective of the shelf life, food scientists estimate that diet soda is good for up to 4 months past its shelf life expiry date, while soda with regular sugar content can safely be consumed up to 9 months after its listed expiration date.