GNU bug report logs - #79296
30.2; format-time-string returns wrongly encoded string in MS Windows Japanese with cp65001 beta config

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From: Shingo Tanaka <shingo.fg8 <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 79296 <at> debbugs.gnu.org, shingo.fg8 <at> gmail.com, corwin <at> bru.st, Bruno Haible <bruno <at> clisp.org>, eggert <at> cs.ucla.edu
Subject: bug#79296: 30.2; format-time-string returns wrongly encoded string in MS Windows Japanese with cp65001 beta config
Date: Tue, 26 Aug 2025 23:19:14 +0900

On Wed, 27 Aug 2025 05:18:34 +0900,
Eli Zaretskii wrote:
> 
> However, since this is Emacs, Shingo Tanaka could test this by setting
> the Lisp variable system-time-locale to the string
> "Japanese_Japan.65001" and repeating the test presented at the
> beginning of this discussion.  Assuming that the build is a UCRT build
> (Corwin?), this should fix the problem, if your analysis is correct.

Here is the result.  Unfortunately it doesn't fix the issue.

(setq system-time-locale "Japanese_Japan.65001")
"Japanese_Japan.65001"

(format-time-string "%y,%d,%m %A" (date-to-time (concat "2025,1,Jan")))
"25,01,01 \220\205\227j\223\372"

Regards,
Shingo

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