If you want to know what day of the year your eggs were packaged on, (layed on?) look on the end of the carton. There should be a 3 digit number. It corrresponds to the day of the year: expressed 001-365. So, for example, today January 11th, would say 011.

The "expiration" (actually a sell by date for eggs, which gives you at least 7 more days) should be at least 2-3 weeks later than the three digit laying date. Eggs do keep a long time, and boy, you sure know when they aren't good anymore, LOL!