A “sell by” date tells the store how long to display the product. It does not show when a product becomes unsafe to use or when it is past its peak performance meaning the product should still be fine to use or consume even past the “sell by” date. For example, milk should be ok to consume for about a week after its “sell by” date.
A “best if used by” or “use by” date is merely the deadline for the product’s best flavor or quality. However, it is not a purchase deadline meaning the product is spoiled or unsafe to consume after the “best if used by” date. If this date has expired and it has been unopened it should still be safe, wholesome and of good quality if handled properly after the “best if used by” date. However, it is always a good idea to toss any cans that are become rusty, dented or swollen.
SUPPLEMENTAL SOURCE: CONSUMER REPORTS MAGAZINE AUGUST 2014