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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.
Coke Zero is sweetened with a combination of aspartame and acesulfame potassium (Ace-K). Coke Zero is the same basic formula as classic Coke while Diet Coke is a different formula completely. Diet Coke is sweetened with aspartame only. There are unsubstantiated theories (at least by Coca Cola) that the unsuccessful release of Coke Two or new Coke was actually the formula for Diet Coke, just sweetened with the classic sugar combination.