How long past the expiration date ,,,,

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When buying the liquid buttermilk in half gallon or quart sizes, how long will you go past the expiration date to use it in recipes. Of course, it shouldn't be drunk 5 or more days past the date, but it could be used in recipes like corn bread or cake , at a further date past. How long would you keep it? And concerning drinking it,, I can not stand to drink it. But, my Mom and my Husband love to drink buttermilk! Anytime I am around them and they drink it in my presence, I say "Ew, yuck, how can you drink it"? And they always say to me, "you don't know what you are missing"!