Production Dates and Shelf Life: How to Read the Dates on the Package

Pu'er packaging often shows several dates at once: the production date printed on the cotton paper, the year on the tong ticket, the batch number, and the expiration date on the Taiwanese Chinese-language sticker. Each means something different, and once you can read them, buying tea gets a lot clearer.

What the Production Date Means

The "production date" on pu'er packaging mostly refers to the day the finished product was completed, that is, when it was steamed and pressed, dried, and packed, and not necessarily when the fresh leaves were picked.

This creates a common gap:

• Spring tea pressed the same year: The production date matches the picking year, e.g., picked April 2024, pressed June 2024.
• Maocha stored before pressing: For example, spring 2022 maocha may not be pressed into cakes until 2024, so the production date reads 2024.
• Ripe tea: Sun-dried maocha first goes through pile fermentation, then storage, refining, and pressing; from raw material to finished product often takes several months.

To find out what year the material was picked, check whether the packaging separately states a material year, or ask the seller directly. Tea seasons are covered in Spring Tea, Summer Tea, and Autumn Tea.

Where "Long-Term Storage" Comes From

China's national standard for pu'er, GB/T 22111-2008, says in its storage section that pu'er is suitable for long-term storage under proper storage conditions. That's why packaging from Yunnan often carries wording like "Shelf life: suitable for long-term storage under proper storage conditions."

The premise of that sentence is "proper storage conditions": clean, ventilated, away from light, dry, and free of odors. Kept somewhere damp, stuffy, or smelly, even the best tea will deteriorate. Storage conditions are covered in Temperature and Humidity for Storing Pu'er.

Can "Long-Term" Be Used in Taiwan?

For packaged food sold in Taiwan, the expiration date is a mandatory label item listed in Article 22 of the Act Governing Food Safety and Sanitation, and Article 13 of its Enforcement Rules provides that:

• The expiration date must be printed on the container or outer packaging.
• The year, month, and day must be indicated in a customarily recognizable way.
• For products with a shelf life of three months or more, the year and month alone may be given, with the last day of that month as the end date.

"Long-term" isn't a date, so for tea sold in Taiwan, the business must set a specific expiration date based on its product's characteristics and print it on the Chinese-language label. The "long-term storage" wording on the original Yunnan packaging can stay as information from the place of origin; the expiration date on the Taiwanese Chinese-language label is the period the business is responsible for in Taiwan.

Can You Still Drink Tea Past Its Expiration Date?

The expiration date is the period during which the business takes responsibility for the packaged product, and it's also the line for selling: shops can't sell food past its expiration date. For tea you've already brought home, the expiration date is a reference point: well-stored pu'er keeps changing in flavor, while poorly stored tea that shows mold or off odors shouldn't be drunk even if it's still within its date.

Judging the state of a cake still comes back to your senses:

• Look: Are there white or green fuzzy spots on the surface?
• Smell: Is it a clean aged or woody aroma, or musty, sour, or pungent?
• Brew: Is the liquor clean and clear, or cloudy with off flavors?

Other Dates on Chinese Original Packaging

• Production date on the cotton paper or neipiao: Usually year, month, and day; some show only the year.
• Dates on tong or case tickets: The date the whole tong or case was packed.
• Batch numbers: For example, Dayi's "101" and "201," where the first digit relates to the year; how to read them is in Batch Numbers.

What If an Aged Tea Has No Date?

Early Hao-grade and Yin-grade teas mostly have no production date on the packaging. Collectors date them by cross-checking several clues:

• Printing and paper of the cotton wrapper: Typeface, ink, and paper fibers.
• Versions of the neifei and neipiao: Different periods have different layouts; see Neifei and Neipiao and Dapiao.
• The state of the tea itself: Leaf shape, color, aroma, and liquor.
• Provenance and circulation records: Auction catalogs and notes from previous collectors.

These judgments take experience; for valuable aged tea, it's best to go to a trustworthy source and ask the seller to explain its history. Vintage periods are covered in Hao-Grade, Yin-Grade, and Qizi Cakes.

Dates on Guyuntang Products

For Guyuntang's Bingdao Old Village Dragon Pearls and Pu'er Pyramid Tea Bag Gift Box, the production date, expiration date, and other labeling are as shown on the packaging you receive and as confirmed by our staff.

FAQ

Is the production date on pu'er the day the tea was picked? Not necessarily. The production date usually means the day pressing and packing were completed; the material may be from an earlier year, so check whether a separate material year is given.

What does "long-term storage" on the package mean? It's the wording of China's national standard: suitable for long-term storage under clean, ventilated, dark, dry, and odor-free conditions. For tea sold in Taiwan, the Chinese-language label must still show a specific expiration date.

Can the expiration date give only the year and month? Yes. For food with a shelf life of three months or more, the expiration date may give only the year and month, ending on the last day of that month.

An aged tea has no date on the packaging. How can I tell its year? Judge it by combining the versions of the cotton paper, neifei, and neipiao, the state of the tea, and its circulation records; for valuable aged tea, it's best to ask a trustworthy seller to explain its history.