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Past Food Expiration Date: 2-3 months unopened, 1-2 months opened
Expired butter? Not necessarily. Butter fortified with oil will, in general, last twice as long past the expiration date as pure butter (which you can keep on the counter, by the way). Margarine has more additives than butter and thus lasts longer. Opened margarine lasts roughly 2-3 months, and unopened from 4-5 months.
Past Food Expiration Date: 3-4 weeks
How long do eggs last after the sell by date? Well, that depends on whether they’re in the shell. Eggs are a protein and protein takes a while to break down. In fact, fresh eggs with unbroken egg shells can last up to 3-4 weeks after the expiration date has passed. Eggs removed from shells will only last a few days.