There's a whole lot of hoo-hah going on at the moment about the supposedly confusing sell-by, display-by, best before and use-by dates. Apparently, people don't understand them and they are going to be simplified. Yet another example of government interference producing a result which was never intended.
Longrider says all I would wish to say on the subject, but I would add just one thought:
Why is Man the only species on the planet that needs a use-by date on his food in order to know it is safe?