Japanese Food Expiration Dates: Shoumikigen(best-before) vs Shouhikigen(use by)

You pick up an onigiri at the konbini. There are two dates printed on the label, both in kanji you don’t recognize, both followed by numbers. One means “tastes best before.” The other means “do not eat after.” Mix them up, and you’re either throwing away perfectly good food or eating something you shouldn’t be.

Every packaged food in Japan carries one of two date labels: 賞味期限 (shomikigen) or 消費期限 (shohikigen). They look almost identical at a glance — only the second character differs — but they mean fundamentally different things. This guide breaks down the difference, shows you how to read Japanese date formats, and explains what to do when you’re standing in a convenience store at midnight trying to figure out if that egg sandwich is still safe.

The Two Dates: 賞味期限 vs 消費期限

The distinction comes from Japan’s Ministry of Agriculture, Forestry and Fisheries (MAFF) and is applied to virtually every packaged food sold in the country. The core idea is straightforward: one date is about quality, the other is about safety.

The critical difference: after a 賞味期限/shomikigen (best-before), the food doesn’t suddenly become dangerous — it may just taste slightly less crispy, less fresh, or less vibrant. Your cup noodles might have softer vegetables; your soda might be a little flat. After a 消費期限/shohikigen (use-by), the food should be discarded. Period. The MAFF designation for use-by items covers products that spoil rapidly, and the dates are determined through microbiological and chemical testing by the manufacturer.

A quick trick to tell them apart visually: look at the second character. 賞味期限 has 味 (meaning “flavor/taste”) — it’s about taste quality. 消費期限 has 費 (meaning “consumption/expense”) — it’s about whether you should consume it at all.

How to Read Japanese Date Formats

Japanese dates follow Year / Month / Day order — the reverse of the American format and different from the European one. If you’re used to reading dates as Month/Day/Year or Day/Month/Year, this is the single most important thing to get right.

The Reiwa (令和) era format catches some travelers off guard. Japan’s current era, Reiwa, started in 2019 (Reiwa 1). To convert: Reiwa year + 2018 = Western year. So R7 = 2025, R8 = 2026, R9 = 2027. You’ll encounter this more on domestic brands and traditional products than on major convenience store items, which increasingly use the Western calendar.

Products with a shelf life exceeding three months are permitted to show only the year and month (no day). This is common on canned goods, dried snacks, bottled sauces, and long-life drinks. If it says 2027.03, that means the product is good through the end of March 2027.

Where to Find the Date on the Package

The date label typically appears on the back or bottom of the package, near the barcode and the ingredient list (原材料名). Look for the kanji 賞味期限(shomikigen) or 消費期限(shohikigen) printed as a header, with the date on the same line or directly below.

On convenience store bento boxes and onigiri, the date is often printed more prominently — on the front sticker, the side seal, or the top of the container. Konbini staff pull expired items off shelves multiple times a day, so anything you pick up should be within date. Still, it’s worth checking if you’re buying something late at night to eat the next day.

Some products print the date in a location separate from the main label. In those cases, you’ll see a note like 「賞味期限は蓋に記載」 (best-before date printed on the lid) or 「底面に記載」 (printed on the bottom).

What Happens After Each Date?

After the best-before date (賞味期限/shomikigen)

The food doesn’t become inedible overnight. Japanese manufacturers are known for setting these dates conservatively — the actual safe consumption window is typically longer than what’s printed. Before eating, check for changes in smell, color, texture, or taste. If nothing seems off, the food is generally fine.

Some practical examples: cup noodles a week past the date will still taste normal. Potato chips might lose their crunch. Bottled tea may taste slightly flatter. Canned goods can last well beyond the printed date. In all cases, this only applies if the product was stored properly and never opened.

After the use-by date (消費期限/shohikigen)

Do not eat it. This is a safety boundary, not a taste guideline. Perishable foods can develop harmful bacteria or mold after this date, even if they look and smell normal. This is especially true for items containing raw fish, egg, fresh meat, or cream. If you find something in your hotel fridge that’s past its 消費期限, throw it away.

Quick Reference: Which Label Appears on What?

Practical Tips for Travelers

If you’re buying snacks at the airport or a convenience store to bring home as souvenirs, check for 賞味期限(shomikigen) — most packaged snacks, cookies, and sweets carry a best-before date weeks or months out, so they’ll survive the journey. Items with a 消費期限(shohikigen), like fresh mochi or cream-filled pastries, won’t last more than a day or two and shouldn’t go in your suitcase.

In supermarkets, understanding these dates helps you take advantage of late-evening discounts without worrying about safety. That 半額 bento at 8 PM? Perfectly fine for tonight’s dinner. The 30%-off sashimi tray? Eat it within the hour.

When in doubt, the fastest way to check is to point your phone’s camera at the label. Google Translate’s camera mode can identify 賞味期限(shomikigen) and 消費期限(shohikigen) instantly — which brings us to connectivity.

Frequently Asked Questions