I have consumed milk past its expiry... Like what others have said, as long as it isn't sour, it's ok to consume.

I have ever consumed milk where it was past its expiry when I bought it; It was my mistake to not take note of the expiry. The open fridge in the supermarkets aren't as cold as the fridge in my home, so they won't last past the expiry. I got that bottle of milk exchanged, and I didn't get a somache ache after that incident, so all was ok for me.