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From: "tamuki at linet dot gr.jp" <sourceware-bugzilla@sourceware.org>
To: libc-locales@sourceware.org
Subject: [Bug localedata/24162] ja_JP LC_TIME: era offset for Taisho GanNen
 and BC direction
Date: Thu, 07 Feb 2019 06:17:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D24162

--- Comment #5 from TAMUKI Shoichi <tamuki at linet dot gr.jp> ---
Hello Morimitsu-san,

(In reply to junji morimitsu from comment #0)
> 2:  The offset of Taisho Gan Nen (1912) is '2', but it should be '1'.
>     Gan Nen means the 1st year, Taisho started on 1912-07-30.

Yes, you are right.  Probably, this typo was introduced when creating
ja_JP localedata, but it has been overlooked so far.  I think it sould
be corrected.

> 3:  The direction of BC is '+', but it should be '-'.  The start_date
>     (-1/12/31) is the last day of BC.  The direction is backward.
>     However I cannot show how to use this flag.  Only decoration?

There is no need to change this:

$ date -d "2016 years ago" +"%EY"
=E8=A5=BF=E6=9A=A603=E5=B9=B4
$ date -d "2017 years ago" +"%EY"
=E8=A5=BF=E6=9A=A602=E5=B9=B4
$ date -d "2018 years ago" +"%EY"
=E8=A5=BF=E6=9A=A601=E5=B9=B4
$ date -d "2019 years ago" +"%EY"
=E7=B4=80=E5=85=83=E5=89=8D01=E5=B9=B4
$ date -d "2020 years ago" +"%EY"
=E7=B4=80=E5=85=83=E5=89=8D02=E5=B9=B4
$ date -d "2021 years ago" +"%EY"
=E7=B4=80=E5=85=83=E5=89=8D03=E5=B9=B4

If you change '+' to '-', it will be as follows:

$ date -d "2016 years ago" +"%EY"
=E8=A5=BF=E6=9A=A603=E5=B9=B4
$ date -d "2017 years ago" +"%EY"
=E8=A5=BF=E6=9A=A602=E5=B9=B4
$ date -d "2018 years ago" +"%EY"
=E8=A5=BF=E6=9A=A601=E5=B9=B4
$ date -d "2019 years ago" +"%EY"
=E7=B4=80=E5=85=83=E5=89=8D01=E5=B9=B4
$ date -d "2020 years ago" +"%EY"
=E7=B4=80=E5=85=83=E5=89=8D00=E5=B9=B4
$ date -d "2021 years ago" +"%EY"
=E7=B4=80=E5=85=83=E5=89=8D-1=E5=B9=B4

Regards,
TAMUKI Shoichi

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