Shane F. Carr

Belated notes from 2025-07-31 ICU4X WG: - @robertbastian I don't think anyone would care even if we reverted to Gregorian months in 200 years. as long as it's deterministic. this...

The official body implementing GB/T 33661-2017 is the Purple Mountain Observatory: http://www.pmo.cas.cn/xwdt2019/kpdt2019/202203/t20220309_6386774.html Here is their almanac for 1900 through 2025 in PDF form: http://www.pmo.cas.cn/xwdt2019/kpdt2019/202203/P020250414456381274062.pdf The Hong Kong Observatory, while not...

Manually reading the PMO document, the month start dates from 1900 to 1912 are: 1900: 01-01 01-31 (New Year) 03-01 03-31 04-29 05-28 06-27 07-26 08-25 09-24 (Leap Month) 10-23...

> According to https://github.com/dotnet/runtime/blob/1d1bf92fcf43aa6981804dc53c5174445069c9e4/src/libraries/System.Private.CoreLib/src/System/Globalization/ChineseLunisolarCalendar.cs#L34 how the months of the Chinese calendar were actually used in 1906 differs from Reingold's math. > > Decide if the calendar offered by ICU4X is...

Relevant for this discussion: the PMO document has a forward that states > 3. 解放前编算出版的历书,由于计算条 件 的 限 制,会 出 现 与 现 代 历 书 计 算 模 型...

Belated notes from ICU4X WG, 2025-07-31: - @hsivonen For the Chinese lunar calendar in Taiwan, it would be nice to look at sources. - @sffc CLDR has the Chinese and...

Reopening this issue to track adding tests for this

The Hong Kong Observatory as well as Reingold both think there will be a M11L in 2033. The Purple Mountain Observatory hasn't yet published data. I wanted to check how...

Please don't mark the comments as off-topic. I posted them here because this is the thread where we have other research into the Chinese calendar algorithms. It serves as a...

> Can you elaborate why your detailed calculations for a year that is not being discussed in this thread, and for which you arrive at the same results as all...