In food there are no "expiration dates" the dates on food items fall under "best by" "use by" "sell by" and "best used by". And yes these are a good indication for when a food item will no longer be good but mostly it indicates that at this point a substantial decrease in quality will be present. This can include nutrient decrease, off color will occur, spoilage mat occur, off odor etc. Eggs are a little different the date that comes on eggs is a sell by date and the numbers that often appear above the sell by date are the Julian date. These tell when this batch was packed. The numbers are a three digit number system.
Remember that a food that is "spoiled" ie moldy or tastes bad may not harm you any more than an upset tummy. More often the foods that have things like salmonella and E.coli will look perfectly fresh and tasty. Mold and yeast are everywhere and they will harm us less often than the viruses that are lurking on "good" food caused by mishandling.
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Frivolity, at the edge of a Moral Swamp, hears Hymn-Singing in the Distance and dons the Galoshes of Remorse. ~Edward Gorey
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