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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.
How long will an unopened can of soda last? Depends on whether it's diet or not, as the ingredients affect shelf life. Typically most diet sodas start to lose quality 3 months after the date stamped, while non-diet soda â¦ will last 8-9 months after the date.