There's no use crying about it, all milk gets old some day. And today I have about a litre of milk on the way out. So how do I use it before it ticks over it's use-by?
Perhaps the quickest way to use up milk is to make cheese. Not the stinky kind like my Austrian Grandmother used to make, but white, soft, mild paneer. All you do is bring milk to the boil then take it off the heat and add a teaspoon of lemon juice or vinegar and watch it curdle. Add a bit more lemon juice if it doesn't curdle. Drain off the whey through a cloth (hang it for a few minutes for harder paneer) and use it straight away in any dish where you would use paneer or ricotta. I'm telling the truth, it's that easy. And it uses a lot of milk, a litre will barely make enough for three or four people.
Then there's milk sweets such as rice pudding or carrot halwa...and if all else fails and you miss the use by date sour milk can be used to make Irish Soda Bread. Delicious!