I purchased some ground beef Monday night. I was in a hurry and didn't pay attention to the sell by date. I went to get the ground beef out of the fridge and it doesn't look to great. The sell by date says 8/26/13. Today is the 28th. Is the ground beef still safe to cook and eat? I looked online and it says that it is safe to eat for a couple of days after the sell by date but I am not sure.