[ruby-core:92103] [Ruby trunk Feature#15742] Add Date#jisx0301 support new Japanese era

Issue #15742 has been updated by akr (Akira Tanaka).


nobu (Nobuyoshi Nakada) wrote:

> Maybe, we should await next JIS X 0301?

I think it is too late.
JIS X 0301 update schedule is not shown.

However, we can wait vendors such as Microsoft.
Microsoft also needs the single letter abbreviation of Reiwa.

- HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\Calendars\Japanese\Eras
  https://support.microsoft.com/ja-jp/help/4469068/summary-of-new-japanese-era-updates-kb4469068

- seminar held by Microsoft and METI (経済産業省), 2019-04-05
  https://www.microsoftevents.com/profile/form/index.cfm?PKformID=0x6474232abcd

I hope some guideline including the abbreviation will appear.

> Patches updated.

You missed URL.
I found: https://github.com/nobu/ruby/tree/feature/japanese-reiwa



----------------------------------------
Feature #15742: Add Date#jisx0301 support new Japanese era
https://bugs.ruby-lang.org/issues/15742#change-77430

* Author: kaishuu0123 (Koki Oyatsu)
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
## Reproduce process

```
irb(main):002:0> require 'date'
=> true
irb(main):003:0> Date.new(2019, 5, 1).jisx0301
=> "H31.05.01"
```

* ruby version: trunk

## Result of reproduce process

```
irb(main):003:0> Date.new(2019, 5, 1).jisx0301
=> "H31.05.01"
```

## Expected result and the reason why you expect

```
irb(main):002:0> require 'date'
=> true
irb(main):003:0> Date.new(2019, 5, 1).jisx0301
=> "R01.05.01"
```

### reason

* new era (Reiwa?) starts from 2019/05/01
* refs: https://github.com/ruby/ruby/blob/trunk/ext/date/date_core.c#L7049
* I can't be sure that initial letter is "R".



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