Subject: bug#55284: 28.1; TODO Mode - Unable to operate if `calendar-date-style' is set to 'iso

From: Eli Zaretskii <[email-masked]>
Date: Fri, 06 May 2022 09:44:27 +0300

> Date: Fri, 6 May 2022 00:01:37 +0100
> From:  Christos Ballas via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <[email-masked]>
> 
> Starting from emacs -q
> (setq calendar-date-style 'iso)
> M-x todo-show -> Test -> Test
> In the newly constructed buffer type "i i Test2<enter>"
> Emacs will now hang until you type "C-g"

It looks like todo-mode.el is basically incompatible with any
calendar-date-style but 'american'.

(Btw, you aren't supposed to set calendar-date-style directly.  But
going through the Customize interface, as you are supposed to, doesn't
help in this case, because the relevant todo-mode patterns are
defconst's.)