Sell by dates and best by dates are not actually mandated by the Food and Drug Administration (FDA). Unless it’s for infant formula, the dates on packages are voluntarily provided by the manufacturers. Stores can even sell products that are weeks or months “past” their dates.
Most expiration dates on foods in cans range from 1 to 4 years—but keep the food in a cool, dark place and the cans undented and in good condition, and you can likely safely double that shelf life from 3 to up to 6 years.
According to their guidelines, canned food (when kept at relatively stable temperatures) will remain at peak quality for at least two years after it's been processed. They note that while food in cans "retains its safety and nutritional value well beyond two years," its color and texture may change after that time. Many factors affect how long a food will stay edible in the can, but food kept at "moderate temperatures [75 degrees or below]" may last indefinitely.
“Canned foods do not expire on a certain date,” explains Giles. “One cannot say that the canned food is good on one day and not good the next day. Canned foods are under a vacuum. The absence of oxygen helps to extend the shelf life of canned foods.”
My suggestion to you is to always buy good canned food. What do I mean. Some time they will put dented, open, or punctured cans on sale. Do not buy these cans. If the can is compromised in any way you should not eat it, if it's still in date or not.
As far as the expiration date goes you should use common sense. You should always rotate your stock. If it is way past the expiration you should probably thought I out but, a year or so shouldn't matter. This is not the same for refrigerated, frozen or boxed food. All of these things you should get rid of when they expire.
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