Foods with expired sell by dates can still be at their best quality and safe to eat if stored properly.

Milk should last up to 7 days past the sell-by date if properly refrigerated. Properly stored, unopened shelf-stable UHT milk will generally stay at best quality for about 2 to 4 weeks after the date on the package when stored at room temperature. They are best kept in the fridge and eaten within five to ten days of purchase.

The date stamped on milk cartons is neither an expiration date, nor a best by date (at least in the USA). Milk cartons are stamped with a sell by date.

This is used solely to designate when the store must sell it by. According to Eat By Date, once opened, all milk lasts 4-7 days past its printed date, if refrigerated. However, you can still end up with spoiled milk if you don’t store and handle it properly.

Depending on the source, milk should be fine to drink up to a week after the expiration date, according to WebMD.

This is distinctly different.

It's still sealed, I had it in the back of my walk-in closet, pretty far back in, with no light or anything.

If unopened, shelf-stable, non-dairy kinds of milk keep much longer — up to … Make sure to tightly close the lid after each use. Wisconsin Milk Marketing Board’s Adam Brock says he’d generally give a milk carton five days past its sell-by or best-by date, but that the industry standard says milk will be fine up to a week past those dates. The printed expiration date on milk is really just a sell by date, and milk is usually still good for a few days after that. I have new containers, just wondering if it's useful. The date the milk goes bad is some time after that. If a drug says the expiration date is 18 months hence, it means these three qualities can only be guaranteed that long, assuming the drug is stored properly.

A quick sniff test can generally determine whether milk has gone bad after a best by date … Just curious if anyone here would bother with it. Never run out of Horizon again—just stock the pantry with shelf-stable.

The take-away does that even under the british pasteurization processes and storage situations, a store's sell by dates can not be beyond 21 dates after the milk expired the cow.
According to Web MD, the only item actually mandated to have an expiration date is infant formula.Everything else is voluntary. Recommended best practices are to open the bottle, remove the exact amount of product you wish to consume, and then close the lid tightly. The date stamps on food items, explained. Let us set the record straight: milk does not inherently last longer just because it's organic. The date the milk goes bad is some time after that.