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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.
Diet Coke made by Coca-Cola does not contain sodium benzoate, a change that was made voluntarily by the company in 2008. Coca-Cola's other drinks, including Fanta and Sprite, continue to use E211 in production. The company states that alternatives to E211 impact preservation and change the taste of the product.