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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.
If stored around 37 degrees Fahrenheit, pasteurized milk will remain fresh for two to five days after its sell-by date. And yogurt? Use within seven days of opening and keep tightly covered, says Baker. If unopened, it should still be good up to a few weeks after the date stamped on it.