Hi, that ended up being the problem. Specifically, the line at
https://code.orgmode.org/bzg/org-mode/src/442e7a2911e3e0229b1b6dd1fe0449653274ec31/lisp/org-capture.el#L1013
needs to be fixed to read instead

(append `(0 0 ,org-extend-today-until)

On Sat, Apr 7, 2018 at 2:07 PM Nicolas Goaziou <mail@nicolasgoaziou.fr>
wrote:

> Hello,
>
> Robert Irelan <rirelan@gmail.com> writes:
>
> > I have an org-capture template of type file+olp+datetree and :time-prompt
> > t. Whenever I invoke it, it prompts me for a date. If I enter the current
> > date at the prompt, `%u` correctly formats the captured entry with
> today's
> > date. However, if I enter any other date, whether in the future or past,
> > `%u` is formatted with the date 1 day before the date I enter at the
> > prompt. So, for example, if I enter the date "2018-04-01" at the prompt,
> > `%u` is formatted as "[2018-03-31 Sat]". I can consistently reproduce
> this
> > with the following template, and also with version `Org mode version
> 9.1.9
> > (9.1.9-3-gb1a639-elpaplus @
> > /Users/rmirelan/.emacs.d/elpa/org-plus-contrib-20180402/)`.
> >
> > ```
> >                           ("D" "Daily Log" entry (file+olp+datetree
> (lambda
> > nil (concat org-directory "/daily-log.org")))
> >                            "\n* %u Daily log\n:PROPERTIES:\n:Effort:
> > 0:05\n:END:\n*Summary*:%?\n\n*Problem*:\n\n*Insight*:\n\n*Tomorrow*:\n\n"
> > :time-prompt t :tree-type week :clock-in t :clock-resume t)
> > ```
>
> I cannot reproduce it with my configuration and the template above.
> However...
>
> >   org-extend-today-until 4
>
> ... this could be related to the variable above.
>
> Regards,
>
> --
> Nicolas Goaziou
>