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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.
Ff it's cultured (and not pasteurized again after being fermented) then it should last several days after the sell by date. This is usually what they sell as buttermilk. It should just become more sour as it ages, instead of the sudden putrid off smell that pasteurized milk has when it's past it's prime. Now, if it's actual buttermilk, ie, the milk leftover from making butter, it should be good for a day or two past the sell by date. Now, if it's acidified milk made to resemble buttermilk from making butter or cultured buttermilk... I have no idea. Trust YOUR senses.