Issue #15742 has been updated by duerst (Martin D=FCrst).


nobu (Nobuyoshi Nakada) wrote:

> It defaults to Heisei if no era initial letter is found.
> I guess it probably would be expected to the new era now, but it is an in=
compatibility of course.

Yes, incompatibilities like this are unavoidable with a date system such as=
 the Japanese era names.

----------------------------------------
Misc #15742: Add Date#jisx0301 support new Japanese era
https://bugs.ruby-lang.org/issues/15742#change-77406

* Author: kaishuu0123 (Koki Oyatsu)
* Status: Feedback
* Priority: Normal
* Assignee: =

----------------------------------------
## Reproduce process

```
irb(main):002:0> require 'date'
=3D> true
irb(main):003:0> Date.new(2019, 5, 1).jisx0301
=3D> "H31.05.01"
```

* ruby version: trunk

## Result of reproduce process

```
irb(main):003:0> Date.new(2019, 5, 1).jisx0301
=3D> "H31.05.01"
```

## Expected result and the reason why you expect

```
irb(main):002:0> require 'date'
=3D> true
irb(main):003:0> Date.new(2019, 5, 1).jisx0301
=3D> "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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