Food's "best before" date is about quality

Best before date is about quality and not safety. The food will be safe to eat after this date but may not be at its best. Its flavour and texture might not be as good. The best before dates appear on a wide range of frozen, dried, tinned and other foods.

Source: Use by and best before dates @ Food Standards Agency

Image by Balougador (Own work) [GFDL or CC-BY-SA-3.0], via Wikimedia Commons