If you’re confused about the dates you see on egg cartons, it’s not surprising. Food product dating is hard to understand. One of the more puzzling facts is that none of the dates on food packages — not even “use by” dates — are an indication of food safety. Instead, package dates refer to product quality.
An “expiration” or “sell by” date on some egg cartons helps to ensure that the eggs are fresh by informing the grocery store not to sell the eggs after the marked date. These dates are also intended to encourage you to use the eggs when they’re still at their highest quality. An expiration date on the carton is not required but, if one is used, it can be no more than 30 days after the eggs were packed. Since the packer or retailer may choose a date under 30 days, your local retailer can give you more complete information about how many days a “sell by” or “expiration date” allows after packing.
Some cartons show a Julian date on the short side of the carton. The Julian date is the day the eggs were packed — starting with 001 as Jan 1 and ending with 365 for December...