Open it and smell it - off meat has a very distinctive smell. If it smells OK, cook it very well - I would suggest a caserole of pasta sauce type thung with a lenghtyish cooking time. The browness will probably be due to oxidation - not a problem.
There are often two dates on - one for the shop which is a sell by date. There may also be a use by date. These are usually guidelines and an indicator of when quality begins to deteriote. Things can go off before the sell by date!!!! - always do a smell and visual check.
"For to be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others." - Nelson Mandela