Buyer Guides
When "Next Week" Means Two Different Weeks: Confirming Delivery Dates With a Chinese Factory
A Sunday message about "next week" nearly cost us a client's trust. Here is why the week starts on a different day in China and the US, and how to confirm delivery dates so it cannot happen.
By PajamaWorks Team, Sleepwear production team, Dongguan Hualingniao Apparel ·
Never accept “this week” or “next week” as a delivery date from a supplier in another country. China starts the week on Monday; the United States, Canada, Japan and Brazil start it on Sunday, so on a Sunday the two sides are already standing in different weeks. Confirm every milestone as a full written date with the weekday, name the event it refers to, and state the time zone.
We learned this from our own message thread, not from a textbook.
What happened on a Sunday
On a Sunday, a client asked one of our sales reps when their goods would arrive. The rep answered, “next week.”
The client was unhappy. Earlier in the order they had been told the goods were due this week. Now, with no explanation, the factory seemed to be pushing delivery back by seven days.
Nothing had moved. The production plan and the shipping plan were exactly where they had been. The two people were reading the same calendar dates through different weeks:
- For our rep, the week runs Monday to Sunday. That Sunday was the last day of the current week, so “next week” meant the week starting the following morning.
- For the client, the week runs Sunday to Saturday. That Sunday was already the first day of the week they had been promised, so “next week” pointed to the week after it.
Once we wrote out the actual dates, the client saw that the schedule was unchanged, and the conversation moved on. But for a few hours, a client believed we had quietly slipped their delivery by a week. The order was never at risk. The trust was.
Does the week start on Sunday or Monday?
Both, depending on where you live. According to timeanddate’s country-by-country breakdown, about 160 countries start the week on Monday and 67 start it on Sunday. The Sunday group is smaller by country count but larger by population, at more than 4 billion people.
| Week starts on | Examples |
|---|---|
| Monday | China, almost all of Europe, Oceania |
| Sunday | United States, Canada, Brazil, Argentina, Japan, South Korea |
| Saturday | Afghanistan, Iran, Somalia |
The international date standard, ISO 8601, also counts Monday as the first day of the week, which is why European and Chinese business calendars are laid out Monday to Sunday.
The practical consequence is narrow but sharp. From Monday to Saturday, “this week” and “next week” mean the same thing to both sides. On Sunday they do not. Take Sunday, September 20, 2026 as an illustration:
| Said on Sunday, Sept 20 | Monday-start reader (China) | Sunday-start reader (US) |
|---|---|---|
| “this week” | Sept 14–20, ending today | Sept 20–26, starting today |
| “next week” | Sept 21–27 | Sept 27–Oct 3 |
A buyer who catches up on supplier messages on Sunday evening, which is already Monday morning in China, is reading them on exactly the day this gap is open.
Four more ways a delivery date gets misread
The week boundary was the one that caught us. These are the others worth closing at the same time.
“Next Friday” and other relative words
Even inside one country, people disagree about whether “next Friday” is the coming Friday or the one after. Add a second language and the odds get worse. Relative words such as “soon,” “end of the month,” “in two weeks” and “next Friday” describe a feeling about time. A purchase order needs a date.
Numeric date formats
ISO’s own guidance on date formats uses the example 01/05/22, which can be read as January 5 or May 1. In the US the month comes first; in most of Europe the day does; in China the year does. A date written 10/09 can be September 10 or October 9, a month apart.
ISO 8601 resolves it by ordering the parts from largest to smallest: 2026-10-09. If that looks too technical for an email, write the month as a word: Friday, October 9, 2026. Including the weekday is a free error check. If the weekday and the date do not match, someone has made a mistake and you will see it immediately.
Week numbers
Many European buyers plan in calendar weeks (“ship in week 41”), and some factories adopt the habit. It works only if both sides count weeks the same way. Under ISO 8601, weeks start on Monday and week 1 is the week containing the year’s first Thursday. Spreadsheet defaults differ: Excel’s WEEKNUM function starts weeks on Sunday and treats the week containing January 1 as week 1 unless you select the ISO system.
The two systems usually agree in mid-year and drift at the edges. Friday, January 1, 2027 belongs to ISO week 53 of 2026, while Excel’s default calls it week 1 of 2027. If you use week numbers, say “ISO week 41” and add the Monday and Sunday dates the first time.
Time zones and “end of day”
China runs on a single time zone, UTC+8. “By end of day Friday” in Dongguan has already passed when Friday morning starts in New York, and “end of day Friday” in Los Angeles is Saturday morning here. For anything with a real cutoff, such as artwork approval before a print booking or a payment before a vessel closing, write the time with its zone or its UTC offset. The W3C date and time note shows the unambiguous form, for example 2026-10-09T17:00+08:00.
Say which date you mean: ex-factory, shipped or arrived
Our client asked when the goods would “arrive.” That word also deserves a definition, because a factory and a buyer naturally think about different moments:
- Ex-factory or cargo-ready date: goods are finished, inspected, packed and available for pickup. This is the date a factory controls.
- ETD: the estimated departure of the vessel or flight.
- ETA port: the estimated arrival at the destination port or airport.
- Delivered to warehouse: after customs clearance and final-mile transport.
Which of these the seller is responsible for depends on the trade term in your contract. The ICC’s Incoterms® 2020 rules exist to allocate cost, risk and obligations between seller and buyer, including the point at which the goods count as delivered. Under a term where the buyer’s forwarder collects the goods, a factory saying “delivery on October 9” most likely means cargo-ready, while the buyer may hear “in my warehouse.”
So ask the question with the event attached: “What is the ex-factory date?” or “What is the ETA at the Port of Los Angeles?” If you are planning backward from a launch, our Christmas pajama production timeline shows how to build the whole calendar from the warehouse-receipt date.
Chinese public holidays that move your dates
A date can be written perfectly and still be wrong if it lands in a holiday. Two breaks matter most for production: Spring Festival in January or February, and the National Day holiday at the start of October. Both follow rules that catch overseas buyers:
- Spring Festival follows the lunar calendar, so its Gregorian dates change every year.
- The State Council publishes the official schedule only in the autumn before the year it covers. The 2026 holiday schedule was released in November 2025.
- Long holidays are partly built by swapping working days, so some weekends around a holiday are official working days.
- Around Spring Festival, sewing operators travel home, and a factory’s real capacity dips for longer than the official days off.
When a quoted date falls near either holiday, ask directly: “Does this date account for the holiday closure, and what is the last working day before it?”
A delivery-date confirmation you can copy
After any call or chat where a date is mentioned, send one written line per milestone in this pattern:
Ex-factory date: Friday, October 9, 2026 (2026-10-09), China time. Please reply to confirm, or send the revised date.
A complete confirmation has five parts:
- The event: ex-factory, ETD, ETA port or delivered to warehouse.
- The full date: weekday, month as a word, day and year.
- The ISO form in brackets, if your team works across several countries.
- The time zone, for anything with a same-day cutoff.
- A request to confirm in writing. Silence is not a confirmation.
Apply the same pattern upstream. Sample dispatch, comment deadlines and pre-production approval all feed the ship date, and a vague approval deadline moves delivery just as surely as a vague ship date. Our guides to how pajama sampling works and preparing a pajama tech pack cover what each of those gates should contain. When you are still comparing pajama manufacturers, notice who answers a date question with a date. It is a small, early signal of how the order will be run.
What we changed
The fix on our side was simple. When a client asks about timing, we answer with a full date, the weekday, and the event it refers to, and we do not write “this week” or “next week” in delivery messages. If a client uses a relative phrase, we reply with the date we understood so that any gap shows up in the same conversation rather than a week later.
We treat it the same way we treat a sealed sample in bulk production: a physical reference removes the argument about what was agreed, and a written date does the same for the schedule. Typical sampling and production durations are listed in our FAQ, but the dates for your order always come in writing with the quotation.
Next step
If you are planning a sleepwear order and need dates you can build a launch around, send us the style, quantity, target market and the date stock must reach your warehouse. We develop custom pajama sets and loungewear from a tech pack or reference garment, and the quote form is the fastest way to get a project-specific schedule, written as dates.
Cover image: “Calendar (close-up, shallow depth of field)” by Dafne Cholet, via Wikimedia Commons, licensed under CC BY 2.0.
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