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Bottom Line. Milk generally stays fresh for up to five days after the date on the carton, but itâs better to be safe than sorry. Note the date on the milk before you buy it, purchase the carton stamped with the latest date available and then use the date as a guideline, not a rule. Your nose is likely the best judge.
Most sour creams have a âsell-byâ date. As long as the package stays unopened, the dairy product should be fine for about 2 weeks after that date. If it has an expiration date (instead of a âsell-byâ date), add a week to the expiration date. Once the package is opened, its contents should be fine for 1 to 2 weeks. Of course shelf life of sour milk depends on how and how long (if weâre talking about opened container of sour milk) it has been stored.