GNU bug report logs - #80069
[PATCH] Fix the date on the calendar mode line

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Liu Hui <liuhui1610 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: [PATCH] Fix the date on the calendar mode line
Date: Wed, 24 Dec 2025 17:57:29 +0800

[Message part 1 (text/plain, inline)]

Tags: patch


When 'date' is used in calendar-mode-line-format, the mode line is
expected to show the date closest to cursor position. But it may show
the wrong date with commands calendar-redraw and calendar-other-month:

1. emacs -Q
2. eval the code:

   (require 'calendar)
   (setq calendar-mode-line-format (list '(calendar-date-string date)))
   (add-hook 'calendar-move-hook 'calendar-update-mode-line)

3.  M-x calendar
4. press C-f
   => the cursor and the mode line shows the same day
5. press C-c C-l
   => the cursor remains but the date on the mode line is changed
6. press >
   => the cursor and the mode line is consistent
7. press o RET RET
   => inconsistent dates

[0001-Fix-the-date-on-the-calendar-mode-line.patch (text/x-patch, attachment)]

Message #8 received at 80069 <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Liu Hui <liuhui1610 <at> gmail.com>
Cc: 80069 <at> debbugs.gnu.org
Subject: Re: bug#80069: [PATCH] Fix the date on the calendar mode line
Date: Wed, 24 Dec 2025 12:03:20 +0100

Liu Hui <liuhui1610 <at> gmail.com> writes:

> Tags: patch
>
>
> When 'date' is used in calendar-mode-line-format, the mode line is
> expected to show the date closest to cursor position. But it may show
> the wrong date with commands calendar-redraw and calendar-other-month:
>
> 1. emacs -Q
> 2. eval the code:
>
>    (require 'calendar)
>    (setq calendar-mode-line-format (list '(calendar-date-string date)))
>    (add-hook 'calendar-move-hook 'calendar-update-mode-line)
>
> 3.  M-x calendar
> 4. press C-f
>    => the cursor and the mode line shows the same day
> 5. press C-c C-l
>    => the cursor remains but the date on the mode line is changed
> 6. press >
>    => the cursor and the mode line is consistent
> 7. press o RET RET
>    => inconsistent dates

Hi Liu,

I can confirm this misbehavior and your patch fixes it.  Thanks.
-- 
Manuel Giraud

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