UHT milk (Ultra Heat Treated) is safe to keep unrefrigerated for many years as long as the packaging remains sealed. After the expiry date the product quality and flavour deteriorates. UHT processing does impart a distinctive flavour to milk and that UHT flavour can vary in intensity.
Fresh milk can be raw milk (totally untreated, straight from the teat) which spoils very quickly indeed even if refrigerated, or is most commonly pasteurised. That also is a heat treatment process but is far less intense than UHT, and gives fresh milk a shelf life of about a week if kept sealed and refrigerated, but there are specially filtered pasteurised milks which can double that lifespan. The overwhelming majority of fresh milk is sold as pasteurised milk; in some countries the sale of raw milk is considered to be so unsafe that it is illegal.
So if the milk you have has a very long expiry date then it's been UHT treated and is safe to consume even long after the date on the packaging as long as the packaging remains unopened. After opening it must be refrigerated and has a lifespan of a few days, just like fresh unfiltered pasteurised milk. UHT not only allows milk to be stored unrefrigerated for very long periods but also means that at times of low demand excess fresh milk does not have to be dumped at very low prices or thrown away.
Cows can't just be turned on and off according to demand; whether the demand is there they still need to be milked regularly and fed and cared for.
The expiration for milk in America is usually about 7 days. That's because it's fresh milk. Canned milk might last 12 months (look at the expiration date on the can), or dried milk.
If the milk smells or tastes funny, then pour it down the drain. Don't drink it. Buy only enough to last for one week at a time.
Milk is plentiful in grocery stores, but it has to be kept refrigerated. (Canned or dries milk does not.) The only place I've seen liquid, fresh milk that can last for more than 7 days and be unrefrigerated is in Europe. I saw some in Germany in the early 1980's.
Maybe someday they'll let the rest of us in on their patented secret.
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