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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.
How long is milk good for after the sell-by date? By August 10, 2012. If you bring milk home from the store and open it on the sell-by date, it may be good for anywhere from two to five more days. That assumes you close the container in between uses, don't let it sit out at room temperature, and store it in the colder part of your refrigerator.