On 2025-02-01 18:43, Uwe Brauer via General discussions about Org-mode. 
wrote:
> (BTW do you speak Spanish , since there is some Spanish text in the
> files that are attached)
>
> Anyhow.
>
> Let me see if I understand that correctly
>
>      - Your code does not insert
> * <2025-02-01>
>      But instead
> * Some heading
> :PROPERTIES:
> :CREATED:  [2023-11-17 Fri 19:32]
> :END:
>     that is also ok, but for the moment I prefer the timestamp in the
>     heading, because if I use outline-hide-body I obtain a nice overview
>     with the dates.
>
>
>      - Another problem is that I don't get your code to work for example
>        the one in the file  auto-insert-created-timestamp-as-property.org
>        gives me

Yes, I speak Spanish :)

To generate dates as you said, you can use the following code [0], on 
~man date~ you can find other strftime format constructions, or 
alternatively, visit this [1]

The scheduled thing [2] had an if for certain conditions where you want 
that hook to get triggered (that uses specific buffer names that in my 
case are [2]), for a more simple approach, you might want to experiment 
with a simpler function [3]

I attach again the script migrate-from-ts-header-to-created-property.org 
because I got confused; I hope "soon" I could have a git public repo 
with my emacs config

[0]
#+begin_src emacs-lisp
(defun my/org-add-timestamp-on-heading ()
   (save-excursion
     (org-back-to-heading)
     (org-edit-headline (format-time-string "<%F>"))
     (my/set-property-with-inactive-timestamp "CREATED")))

(add-hook 'org-insert-heading-hook 'my/org-add-timestamp-on-heading 'append)
;; to remove it
;; (remove-hook 'org-insert-heading-hook 'my/org-add-timestamp-on-heading)
#+end_src

[1] https://strftime.org/

[2]

#+begin_src emacs-lisp
(setq my/diary-file "1activity.org")
(setq my/board-file "board.org")
(setq my/proj-file "projects.org")
(setq my/proj-candidates-file "projects-candidates.org")
#+end_src

[3]
#+begin_src emacs-lisp
(defun my/org-heading-insert-scheduled ()
   (save-excursion
     ;; src 
https://emacs.stackexchange.com/questions/72147/org-mode-adding-creation-date-property-upon-heading-creation
     (org-schedule nil (format-time-string "[%Y-%m-%d %a]" nil))))

(add-hook 'org-insert-heading-hook 'my/org-heading-insert-scheduled 'append)
#+end_src