I grew up amidst a "canned society." This mean that I'm familiar with cans as apart of a home pantry, as I can remember my father's "canned precepts" regarding "sign and symptoms" of an out-dated can.
Moreover, his hobby was going on treasure hunting and many times he found cans as old as several years before the finding date, some of which had still well-preserved food as none of the "signs and symptoms" of out-dated or poor sealing was detected.
To make a long story short, as i grew up canned food expiration date seems to be shortened opposed to the manufacturing process improving for safety. Sometime I read from an authoritative source that the expiration date is set with the goal to have people throwing out outdated food when their real shelf life is longer, but is not convenient for the food manufacturing industry that lose money if you don't consume their products on a regular basis.
Similarly many doctors say that outdated medicine, with a few exceptions, cause no harm after the expiration date but degrades its effectiveness with the pass or the months (or years) while some medicine has not really expiration date, but is not convenient for the pharmacy industry make people know that medicine last longer than they say.
Said the above, I simply stick by father's rule and if a canned food has not "signs and symptoms" of expiration, I can consume it safely. I remember myself finding cans on my kitchen store for as long as 5 years and they were in good conditions, tasty and so expensive that I have not been able to buy these delicatessen since I opened those lost cans.