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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.
While hardly an ideal beverage, Diet Coke may seem like a better choice than classic Coca-Cola. Diet Coke has no calories, sugar or carbohydrates, while a 12-ounce can of regular Coke has 140 calories and 39 grams of sugar. But Diet Coke contains ingredients that can cause undesirable side effects, especially when consumed in large quantities.