Okay, real talk: how many times have you stood in your kitchen squinting at a yogurt lid, trying to decide if “Best By 07/14” means “toss it” or “eat it anyway and hope for the best”? Same. It turns out most of us have been reading grocery date labels completely wrong for our entire shopping lives, and once you know the actual code, you’ll waste way less food (and money) at Aldi, Costco, Trader Joe’s, or wherever your cart takes you this week.
We dug into what those stamps really mean, and honestly? It’s kind of wild how little of it has to do with food safety at all. Grab a snack (a safe one, we promise) and let’s decode this together.
“Sell-By” Is a Note to the Store, Not to You
Here’s the twist: a “sell-by” date isn’t aimed at shoppers at all. It’s an inventory cue that tells store staff when to pull a product from the shelf, based on the manufacturer’s own taste and quality testing. It has nothing to do with whether the item is unsafe to eat the next day. Milk, deli meat, and yogurt can often be perfectly good for days (sometimes over a week) after that date, as long as they’ve been stored cold and the seal is intact.
“The sell-by date… was made up by the manufacturer as a way for grocery stores to know when to remove products from the shelves. That date honestly isn’t anything more than an educated guess.” — food safety reporting via Mashed
So next time you spot a marked-down carton with a sell-by date that’s tomorrow, don’t panic-avoid it. That’s often the best deal in the dairy case.
“Use-By” Is About Peak Flavor, Not a Safety Cliff
“Use-By” is the one date actually meant for you, but it’s still a quality marker, not a safety deadline, except on baby formula, which is the one product legally required to be pulled after its date. For everything else, think of “use-by” as “best flavor by.” Your senses are the real test: if it smells fine, looks normal, and the package is undamaged, it’s very likely fine to eat a few days past the printed date.
Those Random Letter-Number Strings? That’s a Julian Code
Ever flip over a can or a box of crackers and see something like “045A” stamped near the seam? That’s a closed, or “coded,” date, and it’s basically a secret handshake between the manufacturer and the store. Many brands use Julian dating, where January 1st is day 001 and December 31st is day 365, so “045” would translate to mid-February. It’s not designed for shoppers to decode at a glance, but now that you know the trick, you can estimate roughly how long a canned or shelf-stable item has been sitting around, which is handy if you’re comparing two cans on the shelf and want the fresher stock.
Store-brand hunters, take note: this is exactly the kind of behind-the-label knowledge that pairs well with Aldi’s pricing secrets — once you’re not tossing food out of unnecessary caution, your grocery budget stretches even further.
Trust Your Nose Over the Number
There’s no single federal rulebook standardizing these dates across the country, and only 41 states even regulate date labeling on some food products. Translation: the print on your label is more of a suggestion than a science. The most reliable test remains the oldest one in the book — look, smell, and trust your gut (pun fully intended). If it’s moldy, sour, or off-color, skip it regardless of what the label says. If it looks and smells normal, that date probably has more wiggle room than you thought.
This same money-saving mindset shows up all over the aisles — check out our roundup of grocery shopping tricks that instantly save you money for more ways to make every trip count, and don’t miss the rest of the secrets grocery employees know that you don’t.
The Bottom Line
Grocery date labels are less “expiration countdown” and more “suggested timeline,” and knowing the difference means fewer trips to the trash can and more money staying in your wallet. So the next time you’re stocking up on Kirkland staples, Trader Joe’s freezer finds, or Aldi weekly deals, give that label a second look before you toss anything. Your fridge — and your budget — will thank you.
Tell us in the comments: what’s the oldest thing you’ve eaten past its “expiration” date and lived to tell about it?
