Twelve Months Is a Test Result, Not a Number You Choose

The EU: 30 months is the switch

The European Union runs a two-track system and the branch point is 30 months. Whatever the unopened shelf life turns out to be, it lands on one side of that line or the other, and the date marking that follows is not optional.

Above 30 months you use the period-after-opening symbol with the relevant 6M, 12M or 24M. At or below 30 months the pack must instead show the day and month after which the product should not be used. Getting this backwards is a familiar finding in market surveillance, because both marks are widely used and only one of them is right for a given formula.

• Above 30 months unopened: apply the period-after-opening symbol with 6M, 12M or 24M as applicable.
• Up to 30 months unopened: apply the day and month of end of use instead.
• Date information must use the official language of the member state where it is sold.
• Minimum font height is 1.2 mm, and the PPWR raises the bar on legibility and durability.

The United States: no mandated format, three-year exemption

The United States is the loose end of this list. There is no single mandated expiration date format, and a product whose shelf life runs beyond three years may carry no expiration date at all. For anything with a shorter shelf life, the FDA's concern is whether the date is false or misleading rather than whether it exists in a prescribed shape.

That freedom carries a quiet obligation. Where a date is shown, it has to mean something, and a brand that prints 12M on the basis of nothing more than a guess has created a misleading claim it cannot defend. The number still has to come out of testing.

1. Decide whether the product even needs an expiration date, given the three-year threshold.
2. Run stability testing and preservative challenge testing to arrive at a defensible shelf life.
3. Check packaging compatibility, because the same formula in a different container can change the answer.
4. If a date is stated, format it consistently and make sure it is not misleading in any state where it is sold.

Japan, China and the rest of Asia

Japan is the strictest of the three in Asia and the format is unambiguous. Products carry a use-by date, the quality holding period, expressed as year and month in YYYY.MM form, which is why Japanese packaging rarely shows a day at all.

China works differently and asks for both halves of the story on one label. The cosmetic labeling rules require the production date alongside the shelf life or the date of end of use, so a Chinese-bound pack typically carries two date elements rather than one. If you are running a global artwork, assume each market will want its own.

• Japan: the use-by date or quality holding period is required in YYYY.MM format.
• China: production date plus shelf life or date of end of use are both required under the labeling rules.
• The Asian formats differ from the EU open-bottle symbol, so a single global pack rarely satisfies all of them.
• Local language rendering matters in both markets, not simply the translated number.

ASEAN and the Gulf: local language is the hard part

Indonesia under BPOM, and Thailand under its own medicines and health product rules, both require the production date and the expiry date to be shown, and both expect them in the local language rather than as a translation appended to an English panel.

This is where artwork schedules slip. Adding a local date in Bahasa Indonesia or Thai is not a font substitution, because it can change the panel layout and therefore the minimum font height calculations the EU would apply anyway. Plan the artwork for the tightest market you are shipping to.

The date on the pack is the only information a customer can actually act on. It is also the piece of artwork most often approved by the wrong person.

How the number is derived in the first place

The period after opening figure is not negotiable and it is not chosen by marketing. It comes out of stability testing, preservative efficacy or challenge testing, and packaging compatibility. Whatever comes out of those three studies is what the symbol may state, rounded down to a labeled period.

Eye area products and products intended for children usually come out shorter than the rest of the range, because the margin for error is smaller and the preservative system is held to a tighter standard. That is normal, and it is worth explaining to a customer service team before a first complaint arrives.

• Stability testing under real and accelerated conditions sets the unopened shelf life.
• Preservative efficacy or challenge testing supports the period after opening claim.
• Packaging compatibility testing catches cases where the container, not the formula, is the limiting factor.
• Eye area and children products typically end up with a shorter labeled period than the rest of the range.