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Manufacturers universally tell you to refrigerate mayonnaise once opened, though, because it helps preserve the flavor. Warmth causes mayonnaise to break down after a while, and it gets to the point where it just tastes oily. Homemade mayonnaise, of course, is a different matter. With its use of raw eggs, it is highly perishable and should be consumed immediately or refrigerated and finished off very shortly.
Yogurt can be safely eaten up to 10 days after its sell-by date; beyond then the live bacterial cultures (which are healthful ingredients, and act as preservatives) will start to die. Mayonnaise is still good for a month after its expiration date (unopened) and up to four months after opening. Eggs, properly refrigerated, should last at least three to five weeks after the sell-by date. Canned goods are good to eat long after labeling dates, as long as the can is in good shape.