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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.
Caffeine-Free Diet Coke: 1983: Diet Coke without the Caffeine. It was the first extension of the Diet Coke formula: Diet Cherry Coke/Diet Coke Cherry: 1986: Diet Coke with a Cherry flavor. Available in US and United Kingdom (as of 2007). Discontinued in Australia and Israel.