How does the dairy industry determine with some accuracy, the expiry date of milk to within 48 hours?!

Question: How does the dairy industry determine with some accuracy, the expiry date of milk to within 48 hours.?

I have worked in the food industry / milk products for over a decade, but haven't been able to figure this out. I am not a food techie, but I do know that milk in the fridge over 3 days past "use by date" is going to be off.
Please get technical with me, pH etc.Health Question & Answer

Answers:

It kind of depends on how cold the milk has been kept if Health Question & Answer

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How does the dairy industry determine with some accuracy, the expiry date of milk to within 48 hours?!

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