L.G.
Buy ORGANIC MILK.
Organic has a much longer expiration period than regular milk.
It's a little complicated why but you can google the question. It has to do with how the milk is processed.
Plus, if you do a little research, you may never let you or your family drink regular milk again. The amount of hormones/chemicals that we ingest are alarming esp. for growing children.
Organic does cost more and I don't buy everything organic ($$$) but for my small kids and the fact that we drink milk every day, it is worth it.
If cost is really an issue, buy it at WalMart. I never grocery shop there but they have the cheapest prices on organic milk.