Freshness is one of those situations where the rules don't really help the consumer. If you look at cartons in the supermarket, you'll find they are labelled with the date the eggs were packed, not the date the eggs were laid. Kinda weird, huh? Why not tell you the day the eggs are laid instead of the day they're packed? That's pretty simple- it's because most of the larger egg packagers don't really know when their eggs were laid. 

We used to track dates carefully, and then we realized that we always sell out by the end of every week, so we simply say "You'll never get an egg from us that is more than a week old." In a supermarket, we're reasonably sure you'll never get an egg that is less than a week old.