bug#53393: 29.0.50; org mode timestamp C-c C-c not updating day of week

[Kyle Meyer]

[ I've reassigned this bug report so that new messages will be directed
  to the Org mailing list, where it's more likely to get a reply.  In
  the future, please consider using org-submit-bug-report or sending a
  message to emacs-orgmode@gnu.org directly. ]

Bruce E. Robertson writes:

> emacs -Q test.org
> cursor to "CLOCK:" line, C-c C-c
> total time updates but day of week does not change
> contents of test.org
> ------
> * heading
> :LOGBOOK:
> CLOCK: [2022-01-17 Tue 10:29]--[2022-01-19 Tue 10:29] => 48:00
> :END:
> ------
> typing C-c C-c does update total log time for line and recently did
> update the day of the week but no long does

I'm having trouble finding an Org version where it will update a
timestamp _within_ a clock line.  I tried it out with v9.1 and the day
of the week still isn't updated.  Outside of that context it will, as
org-ctrl-c-ctrl-c-hook gets through to its timestamp condition rather
than taking the clock branch.

If you can provide more details about a version where it did work,
showing it's a regression, I think you'll have a higher chance of
getting this fixed.

Anyway, at least for now, perhaps you could try something like this to
get the behavior you want:

  (defun my/update-clock-and-days ()
    (when (eq (org-element-type (org-element-context)) 'clock)
      (let ((re (org-re-timestamp 'inactive)))
        (save-excursion
          (goto-char (line-beginning-position))
          (while (re-search-forward re (line-end-position) t)
            (backward-char)
            (org-timestamp-change 0 'day))))))
  
  (add-hook 'org-ctrl-c-ctrl-c-hook #'my/update-clock-and-days)

With that, hitting `C-c C-c` on the clock line at

--8<---------------cut here---------------start------------->8---
* heading
:LOGBOOK:
CLOCK: [2022-01-17 Thu 10:29]--[2022-01-19 Sun 10:29] => 40:00
:END:
--8<---------------cut here---------------end--------------->8---

produces

--8<---------------cut here---------------start------------->8---
* heading
:LOGBOOK:
CLOCK: [2022-01-17 Mon 10:29]--[2022-01-19 Wed 10:29] => 48:00
:END:
--8<---------------cut here---------------end--------------->8---