we lived for years with out ''use by'' or ''best before'' dates and peple survived, so trust your nose and instincts, if in doute throw it out other wise eat it,
The food industry were very pleased when these were introduced as we started throwing out food that was good to eat simply because of a date on the side.
Food can be well in date but very unfit to eat, if it's not been stored correctly rendering the date useless so again trust your nose not the date stamped on the side