Beyond Beef

I have some packed, sealed, cooked beef in the refrigerator, its use-by date is the 6th, were about to enter the seventh and I really want a tomato and onion beef sandwich now and on my journey train tomorrow afternoon.

or it may be discarded?

Eat it and you'll know tomorrow, it will not kill you ...

I do not want, but I'm picky with meat.
I do not buy meat if I'll use the same day.
So if I buy it and do not use it that day, I trash.
Not worth the risk of falling ill.