Issue #15742 has been updated by nobu (Nobuyoshi Nakada).

Tracker changed from Misc to Feature

nobu (Nobuyoshi Nakada) wrote:
> kaishuu0123 (Koki Oyatsu) wrote:
> > I was surprised that handled the omission of era in `Date#jisx0301`.
> 
> More surprisingly, it is required by JIS X 0301; its definition is basically non-era, and the era *may* be preceded.
> > 必要によっては、年の表示の前に元号を識別する記号を付けてもよい。
> > If necessary, the year display may be preceded by a symbol identifying the era.

Note: JIS X 0301 states the era symbol is optional, but doesn't mention the default era in the case it is omitted.
At the best, it will be defined by the application(s), I guess, like announcers in ISO/IEC 2022.

----------------------------------------
Feature #15742: Add Date#jisx0301 support new Japanese era
https://bugs.ruby-lang.org/issues/15742#change-77419

* 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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