Tim Ruffing <crypto@timruffing.de> writes:

> Assume org-extend-today-until is set to an integer greater 0, say 3.
> When I change a timestamp without date such as <2023-01-20> (e.g, when
> rescheduling), the prompt defaults to a day earlier, i.e., to "2023-01-
> 19" in this case. The same happens with <2023-01-20 01:00> which is
> still before 3am. 

Thanks for reporting!
May you try the attached patch?

I am, however, still concerned about how `org-read-date' is handling
`org-extend-today-until'.

If we have something like

* This is test
SCHEDULED: <2023-01-28 Sat>

Then, M-: (setq org-extend-today-until 20)
Then, C-c C-s on the heading above

What will happen if one tries to do "." or +1 or ++1. I find the current
behavior rather disorienting. Could someone check what we promise in the
Org manual, `org-read-date' docstring, `org-extend-today-until'
docstring, and what actually happens in practice?