What the Numbers on Your Egg Carton Really Mean — And Why Ignoring Them Could Make You Sick

What That 3-Digit Egg Carton Code Actually Means

That mysterious three-digit number stamped on the side of your egg carton isn’t a batch code or store tracking ID—it is the Julian Date, indicating the exact day of the year your eggs were packed. Understanding this number is your single best tool for ensuring food safety and preventing egg-borne illnesses like Salmonella.

Decoding the Julian Date System

• 001: January 1st

• 032: February 1st

• 120: April 30th

• 365: December 31st

Crucial Distinction: The “Sell-By” or “Best-By” date is an inventory guideline for grocery stores. The 3-digit Julian date tells you the actual day the eggs left the farm.