From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kyle Meyer <kyle@kyleam.com>
Subject: Re: FYI: with-org-today-date macro, helps with testing
Date: Sat, 29 Jul 2017 16:26:23 -0400
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To: Adam Porter <adam@alphapapa.net>, emacs-orgmode@gnu.org

Adam Porter <adam@alphapapa.net> writes:

> Kyle Meyer <kyle@kyleam.com> writes:

[...]

>> You should be able to simplify the macro body to
>>
>>     `(cl-letf (((symbol-function 'org-today) (lambda () (date-to-day ,date))))
>>        ,@body)
>
> Hi Kyle,
>
> I tried that, but it didn't work, so I had to come up with this uglier
> one.  I couldn't figure out why, but with cl-letf, the redefined
> function didn't seem to persist deeper in the tree of function calls,
> only to the first level.  Maybe I did something wrong, but all I know
> now is that at least this works.  :)

On my end,

  (defmacro with-org-today-date (date &rest body)
    `(cl-letf (((symbol-function 'org-today) (lambda () (date-to-day ,date))))
       ,@body))
  
  (with-org-today-date "2017-07-05 00:00"
    (let ((org-agenda-files (list "~/test.org"))
          (org-agenda-span 'day))
      (org-agenda-list nil)))

produces the same result as your original macro.

-- 
Kyle