From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eli Zaretskii <eliz@gnu.org>
Subject: bug#34684:  bug#34684: 26.1; Strange characters when inserting date
Date: Tue, 12 Mar 2019 17:53:08 +0200
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	(message from Takaaki Ishikawa on Tue, 12 Mar 2019 12:42:39 +0900)
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To: Takaaki Ishikawa <takaxp@ieee.org>
Cc: Philip.Wong@warwick.ac.uk, rpluim@gmail.com, 34684@debbugs.gnu.org

> From: Takaaki Ishikawa <takaxp@ieee.org>
> Date: Tue, 12 Mar 2019 12:42:39 +0900
> Cc: Robert Pluim <rpluim@gmail.com>, Eli Zaretskii <eliz@gnu.org>, 
> 	"34684@debbugs.gnu.org" <34684@debbugs.gnu.org>
> 
> Have you tried to use `set-local-environment'?
> I usually use the command to change the date formatting in my init.el as follows:
> 
> (set-locale-environment "en_US.UTF-8") ;; "ja_JP.UTF-8"

You are on GNU/Linux, right?  Because the above will not work on
Windows, because UTF-8 os not reliably supported, not even in Windows
10 (which added some improvements in that area).

But perhaps this could help:

  (set-language-environment "Chinese-Big5")

However, it's possible that even this will not help, unless the system
codepage is changed to something that can support Chinese.