Editorial accountability
Corrections
This page lists every occasion on which Japan Booking Planner published a booking rule that the operator's own source did not support, together with the conflicts that are still unresolved. It is kept because a site whose whole purpose is telling you when to book has no business hiding the times it got that wrong.
Each entry names what this site said, what the official source actually publishes, what the error would have cost a traveller who trusted it, and the page that settles it. Six of the seven entries below were found during a single systematic re-check of every rule that produces a date, on 31 August and 1 September 2026.
6 corrections published1 conflict still open
- Corrected
The Kaiyukan ticket link used a host abandoned since 2021
- What this site said
- Both the official and booking links pointed at a ticket subdomain whose TLS certificate expired on 30 March 2021 and whose certificate name does not match that host, so a reader following it met a browser security warning.
- What the official source says
- The aquarium's own domain states the mechanics directly and presents a valid certificate. Reading it also corrected an overstatement on this site: dated, time-designated e-tickets are recommended rather than required, and same-day counter tickets remain on sale, with the caveat that they may not admit you at your preferred time.
- What the error would have cost
- Five years is not a lapsed certificate, it is an abandoned host, and this site should not have been sending readers to it.
- Open conflict
La Cime's own site gives two different booking windows
- What this site said
- No date was ever published for this restaurant, and none is published now. This entry records an unresolved conflict rather than a correction.
- What the official source says
- The restaurant's Japanese reservation page states bookings are taken up to the same day two months ahead, while its English page on the same site states up to one month ahead. Both were still live when checked.
- What the error would have cost
- Choosing either figure would mean picking a winner between two official statements, and picking wrong would send a reader to the booking form a month late. The experience page explains the conflict and advises acting on the earlier date, because attempting at two months costs nothing if the shorter window is the accurate one.
- Corrected
Saihoji was described with a postal rule the temple no longer uses
- What this site said
- This site recorded a postal application window opening two months before the visit and closing one month before, and calculated a booking date from it.
- What the official source says
- The temple now runs its own reservation portal, and its current page states that visitors must make a reservation at least one day in advance, booked online or by return postcard or airmail, with an account required, every visitor named and each reservation limited to two people.
- What the error would have cost
- This one pointed the wrong way. A traveller three weeks from their trip was told the window had closed, when in fact they could still book the day before. Saihoji's reputation as nearly impossible to enter has outlived the rule that created it, and most guides still repeat it.
- Corrected
The Shirakawa-go bus borrowed another route's booking window
- What this site said
- This site stated that reservations on the Takayama-Shirakawa-go route open one month in advance, and marked it verified.
- What the official source says
- Nohi Bus does publish a one-month window, but only for four other routes: Takayama/Hirayu Onsen-Shinjuku, Takayama-Kyoto/Osaka, Takayama-Nagoya and Takayama-Gujo Hachiman/Gifu. The Takayama-Shirakawa-go-Kanazawa line's own page publishes no advance-sale date at all, stating only that departures marked R require a reservation and that online booking runs 05:00-02:00 Japan time.
- What the error would have cost
- A neighbouring route's rule had been generalised onto this one, producing a countdown the operator never published. The calculation was removed rather than estimated, and the page now tells readers to read their exact timetable row.
- Corrected
The official sumo ticket link led to an error page
- What this site said
- The stored official source was an address missing both the www host and the trailing slash, which returns the association's own error page reading 「URLに誤りがあります」.
- What the official source says
- The working address confirmed the rule and also confirmed why no lead time can be calculated: the association publishes a separate advance-sale date for every grand tournament, and the interval to the first day is not constant. In the published 2027 schedule it ranges from 29 days for the May tournament to 57 days for July and November.
- What the error would have cost
- A reader following the site's own "official source" link would have landed on an error page. A single lead-time formula would also have been wrong for most tournaments, so the calculation stays null and the page sends readers to the official table.
- Corrected
Tokyo Disney dates fell a day before sales opened in short months
- What this site said
- The calculator rolled a missing day-of-month backwards to the last day of the shorter month, which is the normal convention and was applied to every rule.
- What the official source says
- Tokyo Disney Resort publishes the opposite exception: tickets for admission two months later go on sale daily at 14:00 Japan time, and if the same day of the month does not exist that month, purchases can be made from 2:00 p.m. on the first day of the next month.
- What the error would have cost
- For a 30 April visit the calculator returned 28 February against an official 1 March, sending travellers to check a day before sales had opened, for both Tokyo Disneyland and Tokyo DisneySea.
- Corrected
Tokyo Skytree released dates two to four weeks late
- What this site said
- This site recorded the release as the same day of the month, two months before the visit, and marked it verified.
- What the official source says
- Skytree's official ticket FAQ publishes a monthly batch instead: admission goes on sale on the 1st of the month two months before the visit month, releasing that whole month at once. Its own worked example is that admission for 1-30 June is released on 1 April.
- What the error would have cost
- For a 30 June visit the old rule produced 30 April against an official 1 April, so the planner told a traveller to act 29 days after tickets had gone on sale. A 15 June visit was 14 days late. Only visits falling on the 1st were right, by coincidence.
How these are found
Every rule that produces a date is re-opened against the operator's own page, not against a search result or a previous version of this site. A rule whose official wording does not support an exact date keeps no calculation at all, and a rule whose sources contradict each other is published as uncertain rather than resolved by preference.
If you find something here that is wrong or out of date, the contact form reaches the editor directly and corrections are recorded on this page with the date they were confirmed.