Decoding egg carton labels can be confusing, but a key standard is a three-digit Julian date code running from 001 to 365. Rather than an expiration date, this marking indicates the exact day of the year the eggs were packed—such as 032 for February 1 or 198 for July 17. An additional code starting with “P” pinpoints the specific grading facility. While these details help shoppers compare relative freshness, a critical safety limitation remains: **”A carton code cannot determine by itself whether an egg is safe to eat.”**

Visual checks and popular home tests can be equally deceptive. The common floating water test only measures age, as eggs naturally form a larger internal air pocket as time passes. However, floating reveals nothing about microbial safety or contamination. As the original text notes, **”An egg can look, smell, and behave normally while still carrying bacteria such as Salmonella.”** Therefore, relying on simple home freshness experiments is far less effective than practicing consistent food safety.

Proper storage is the most critical factor in preventing bacterial growth after purchase. Keeping raw shell eggs in their original carton on an interior refrigerator shelf at 40°F (4°C) or lower preserves quality and safety for several weeks. Eggs with severely damaged or dirty shells should be discarded immediately. Maintaining consistent low temperatures prevents harmful pathogens from multiplying rapidly inside the shell.

Safe kitchen habits are essential whenever you prepare raw eggs for cooking. Wash hands, clean utensils, and sanitize counter surfaces that touch raw eggs to reduce cross-contamination with ready-to-eat foods. Always cook eggs until both the whites and yolks are firm. Cooked egg dishes can be safely stored in the refrigerator for several days, while hard-cooked eggs generally remain safe for about a week.

Ultimately, consumers must recognize that **”carton codes are useful clues, not guarantees.”** While dates and facility codes offer helpful context about when eggs were packed, total safety depends on the entire journey from initial store purchase to your final plate. Proper refrigeration, clean preparation surfaces, intact shells, and thorough cooking matter far more than a simple floating egg test or a printed carton date.