China and Japan build their holiday years from opposite starting points, and that is why teams spanning the two keep getting caught out. Japan legislates a list of named national holidays and then applies mechanical rules to tidy up weekend collisions. Mainland China legislates a short list of festivals and then reshapes the working year around them by administrative notice. One country's calendar is a rulebook; the other's is an annual decision. Neither is harder than the other, but they fail in different places.
The Japanese machinery
Japanese national holidays come from the Act on National Holidays, which does three things worth knowing. It fixes some holidays to a date — 11 February for National Foundation Day, 3 November for Culture Day, 23 November for Labor Thanksgiving Day. It fixes others to an ordinal weekday, which is why Coming of Age Day lands on Monday 12 January 2026, Marine Day on Monday 20 July and Sports Day on Monday 12 October. And it applies furikae kyujitsu, the substitute-holiday rule: when a national holiday falls on a Sunday, the next day that is not already a holiday becomes a holiday instead.
2026 gives a textbook demonstration. Constitution Memorial Day is 3 May, which is a Sunday. Greenery Day on 4 May and Children's Day on 5 May are already holidays, so the substitute cannot land there. It rolls to Wednesday 6 May. The result is a Golden Week that runs from Showa Day on Wednesday 29 April, dips into a short working stretch, and then closes with an unbroken 3 to 6 May block.
Japan also has a lesser-known device, kokumin no kyujitsu, which turns a lone weekday trapped between two national holidays into a holiday of its own. It is worth knowing because it explains why Japanese September can produce a longer break out of what looks like two separate holidays; in 2026 Respect for the Aged Day is Monday 21 September, Autumnal Equinox Day is Wednesday 23 September, and Tuesday 22 September becomes a citizens’ holiday between them. The equinox-based holidays are astronomical rather than fixed, and the Cabinet Office confirms the following year's dates formally in advance, so September and March are the two months where an old calendar is most likely to be wrong.
The mainland machinery
China's side is covered in detail in how tiaoxiu works, so the short version: the General Office of the State Council publishes the year's leave windows the previous autumn, converting nearby weekends into working days to fund longer consecutive breaks. The 2026 blocks that matter for Japan-facing work are 15 to 22 February around Lunar New Year's Day on 17 February, 1 to 5 May, 25 to 27 September and 1 to 7 October.
Where 2026 actually collides
| Window | Mainland China | Japan | Risk |
|---|---|---|---|
| 15–23 Feb | Spring Festival block (9 days) | Emperor's Birthday on Mon 23 Feb coincides with China's last leave day | One-sided. Japan keeps moving; China stops. |
| 29 Apr – 6 May | 1–5 May Labour Day block | 29 Apr, then 3–6 May | Two-sided. The worst overlap of the year. |
| 21–27 Sep | 25–27 Sep Mid-Autumn | 21–23 Sep | Staggered. Different halves of the same week. |
| 1–12 Oct | 1–7 Oct National Day | Working until Sports Day, Mon 12 Oct | One-sided, then a Japanese Monday just as China returns. |
The late-April to early-May window deserves its reputation. Japan is largely closed on Wednesday 29 April and again from Sunday 3 May to Wednesday 6 May. China is closed from Friday 1 May to Tuesday 5 May. There is no clean day in that stretch on which both countries are reliably at full strength, and the two working days that do exist are the ones everybody uses to clear their own backlog. Anything requiring a joint decision should be settled by Tuesday 28 April or deferred to the week of 11 May.
The September pattern is the opposite problem and easier to solve. Japan is out on the Monday and Tuesday; China is out from the Friday. That leaves Wednesday 23 and Thursday 24 September as the only days both sides are in. If you have one joint meeting to hold that month, hold it then, and hold it early in the Japanese day.
The Obon trap
Mid-August is where calendar tools mislead people most badly about Japan. Obon is not a statutory national holiday. It will not appear as a public holiday on any correctly built calendar, including ours. But a large share of Japanese companies close for several days around mid-August anyway, factories included, and the domestic transport network behaves as though it were a national shutdown. The only statutory day in the vicinity is Mountain Day on Tuesday 11 August.
The same warning applies to the year-end. Japanese firms commonly shut from late December into the first days of January, well beyond the single statutory holiday on 1 January. China's official New Year break in 2026 is 1 to 3 January, and the culturally heavy break comes six weeks later. So the last week of December is a Japanese near-blackout and an ordinary Chinese working week, which is precisely the sort of asymmetry that produces an unanswered escalation.
Rules we would actually adopt
- Classify every week of the quarter into one of four states: both working, China only, Japan only, neither. Do this at the start of the quarter, not the week before.
- Freeze scope changes ten days before any two-sided window, and use the window for defect fixes and documentation only.
- Never schedule a release for the last working day before either side's block. The Thursday before is fine; the day itself is not.
- Write decisions into a shared document in the working language of the project, not into a chat thread in one side's native language. After a week away, nobody re-reads a thread.
- Put the return date and a named escalation contact in every out-of-office message. "Out of office" without a return date is useless to someone in a different holiday regime.
Travel, in both directions
Going into Japan, avoid 29 April to 6 May and mid-August. Both are peak domestic travel, and mid-August is also the hottest part of the year in most Japanese cities. The best inbound windows are the second half of June and the first half of November, which contain few holidays and comfortable weather. Note Culture Day on Tuesday 3 November if you are planning that first November week.
Going into mainland China, avoid the February block entirely and treat 1 to 7 October as effectively unbookable at sensible prices. Late March, the second half of June and mid-November are the reliable stretches.
Visa appointments deserve a separate thought: consular sections observe the holidays of both the sending and the receiving country, so an appointment slot can disappear for reasons unrelated to either country's own working week.
Compare the two calendars directly on the China 2026 page and the Japan 2026 page, and if your team stretches further than these two markets, building a coverage calendar generalises the same method to Europe and the United States.
A closing caution. China's arrangement is created by a notice that can be revised, and Japan's equinox holidays are astronomical dates confirmed formally in advance rather than fixed forever. Company shutdowns around Obon and the year-end are conventions, not law, and vary by employer. Confirm with your counterparts and against current official sources before booking travel or committing to dates.