Government regulations. The determination of the dates is highly subjective. Most mfg don't want to fool with it, so they put dates on that will make the government happy.
If it isn't bulging or leaking, it's eatable.
I've got canned goods with dates of 2015 on them, right now.
That 75 o F keeping temp for canned goods is quite vulnerable to a/c failure and power failure in hot parts of the country.
After Hurricane "Ike" in 2008, my neighbors and I were without power for 16 days. After "Alicia" in 1983, my apartment was dark for about three days, but the people across the street were without power for a week. And that was on a major thoroughfare. Interior temperatures ran to 82-85 o daily, declining to about 80 at night.
s Not too good for French wine, either ..... but I don't think California, or Texas, wines would "mind" as much.