Best before, durable life and the shelf a container spends at sea

Date marking is the labelling requirement with the largest gap between how simple it looks and how much it decides. On a domestic pack it is a date. On an export route it is a constraint that interacts with the voyage, the buyer's own rules, and sometimes the destination's regulations, and it is capable of rejecting a consignment that is otherwise perfect.

What Canada requires, and what it leaves to you

Prepackaged food with a durable life of ninety days or less, packaged somewhere other than the retail premises it will be sold from, must carry a durable life date, known as a best before date, and storage instructions where these differ from normal room temperature.

Above ninety days, a date is voluntary.

And then the sentence that surprises people: it is the responsibility of the regulated party to determine whether the product has a durable life of ninety days or less, and the specific durable life information for the products they sell. The durable life of products or categories is not prescribed in regulation.

So in Canada you set your own shelf life. The regulator constrains the form of the declaration and prohibits changes that render the label false or misleading, but the number itself is yours, arrived at through your own testing and judgement.

Worth being precise about what the date means, because it is routinely misread. A durable life date is not an indicator of food safety, before or after the date. It applies to unopened product. Products may be sold after the best before date has passed, because the date is about freshness and quality, not safety.

Export inverts the freedom

Two things change when the product leaves, and they pull in the same direction.

**The destination may prescribe rather than defer.** Where Canada leaves durable life to the manufacturer, a destination may set maximum shelf lives for a category, require a particular date type, or require both a production date and an expiry date where Canada would require neither.

**The buyer imposes a remaining-shelf-life rule.** This is contractual, not regulatory, it is close to universal in retail and food service, and it is the one that actually rejects consignments. A buyer requiring seventy-five per cent of shelf life remaining on arrival will refuse a delivery at seventy per cent, and the refusal has nothing to do with whether the product is good.

The arithmetic of that second rule is where export shelf life is really decided. Production, consolidation, the ocean leg, customs, the importer's warehouse and delivery to the buyer's distribution centre all consume the same number.

A product with a hundred and eighty day shelf life, six weeks of which are spent getting there, arrives with about seventy-seven per cent remaining. Against a seventy-five per cent rule that works, with almost nothing to spare, and any delay anywhere breaks it.

Against an eighty per cent rule it does not work at all, and nothing about the product needs to change for it to fail.

Which means shelf life is a route decision

The practical consequence is that a company entering a distant market may need a longer durable life than its domestic business ever required, and that is a product development question, not a labelling one: packaging, formulation, process, or all three.

The alternative is to shorten the route, which usually means air freight for a product whose margin was built on ocean.

Either way, the decision belongs at the beginning of a market entry rather than at the artwork stage. A company that discovers the problem when its first container is rejected has already built the commercial case on numbers that do not hold.

Two things make this easier to see early. Establish the actual door-to-door transit time for the route, not the sailing time, because the sailing is often less than half of it. And ask the buyer for their remaining-shelf-life requirement in writing before quoting, because it is a term they regard as standard and may not volunteer.

Format, and the ways it goes wrong

Canada specifies the manner in which date markings must be declared. Destinations specify their own, and three differences recur.

**Order.** Day-month-year, month-day-year and year-month-day all exist. A numeric date that is unambiguous to the person who printed it can be read as a different date elsewhere, and 03/04/26 is a genuinely different claim depending on where it is read.

**Which dates.** A destination may require a production or packing date in addition to an expiry date, information a Canadian pack has no reason to carry.

**Terminology.** Best before, use by, expiry and sell by are not synonyms and are not interchangeable across regimes. The terms carry different legal meanings, and translating one into another is a substantive change, not a linguistic one.

Indonesia's meat requirements illustrate how far this reaches beyond the consumer pack: the shipping container is required to show the destination country, the slaughter and production dates and a best-before date. Those are carton markings, printed by whoever packs the carton, and they fail in the place nobody is checking artwork.

Coding is a factory problem before it is a label problem

The date is usually not printed with the artwork. It is applied on the line, by a coder, onto a pack that was printed weeks earlier, and that split is where a surprising share of date failures originate.

Three recur.

**The coder cannot produce the format.** A destination requiring a different order, a different separator, or both a production and an expiry date may be asking for something the existing equipment was never configured to print. That is a maintenance ticket with a lead time, not a setting.

**The carton is coded separately, or not at all.** Retail packs get coded because the domestic market requires it. Shipping containers frequently do not, and destinations that require carton markings are asking for a step the packing line does not currently perform.

**Legibility on a cold or wet surface.** Codes applied to frozen or chilled packaging smudge, fade or fail to adhere, and a date that cannot be read is treated as a date that is not there. This is a genuine cause of rejection and it is invisible in the artwork proof, because the proof was never frozen.

The check is to look at a real coded pack and a real coded carton from the line that will run the export order, in the state they will arrive in, and not at a specification of what the line is supposed to do.

Storage instructions travel with the date and get forgotten

Canada requires storage instructions alongside the date where they differ from normal room temperature. That requirement exists because a date is meaningless without the conditions it assumes.

On an export route the conditions are much less certain than domestically. The cold chain passes through more hands, sits in more warehouses and is verified by nobody you employ. The storage instruction on the pack is the only thing travelling with the product that says what it needs.

For a chilled or frozen product it is worth treating the storage statement as a specification, not a label element: stated in the destination's language, stated on the carton as well as the pack, and stated in terms the destination's own rules recognise.

Canada's own bilingual rules make the same point in miniature, requiring "Keep Refrigerated" and "Garder réfrigéré" on certain shipping containers in both official languages even where the rest of the carton may be in one.

What the date commits you to after it ships

A durable life date is a statement about product you no longer control, held in conditions you cannot verify, for a period you predicted in advance.

Domestically that exposure is short and recoverable. On an export route it is neither, and two consequences follow that companies meet late.

The first is that a shelf-life claim is the thing a complaint is measured against. A product that disappoints before its date generates a claim, and the claim is assessed against the number you printed rather than against how the product was handled. Proving that a cold chain failed in somebody else's warehouse is difficult and usually not worth the relationship it costs.

The second is stock at the far end. Product that ages past a buyer's internal threshold while sitting in an importer's warehouse becomes a commercial problem before it becomes a safety one, and the usual resolution is a discount somebody has to fund. Who funds it is worth settling in the supply agreement, not in the moment.

Both point the same way: a shelf life set with margin is worth more than one set optimistically, and the margin is cheapest to build in at product development, not to negotiate afterwards.

The order to work in

• Establish the real door-to-door transit time for the route before committing to a market
• Get the buyer's remaining-shelf-life requirement in writing before quoting
• Do the arithmetic: shelf life, minus transit, against the buyer's threshold, with a margin for delay
• Check whether the destination prescribes shelf life or date types for the category, instead of assuming it defers to you as Canada does
• Fix the date format unambiguously, and put it on the carton as well as the pack
• Treat storage instructions as part of the specification, in the destination's language, on both

If the arithmetic does not work, the answer is a longer shelf life, a faster route or a different market. It is not a more optimistic date, which is both a false statement on a label and the one version of this problem that becomes somebody's health.