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 10:43:29 -0400
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References: <87fudfepqo.fsf@alphapapa.net>
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To: Adam Porter <adam@alphapapa.net>, emacs-orgmode@gnu.org

Adam Porter <adam@alphapapa.net> writes:

> #+BEGIN_SRC elisp
>   (defmacro with-org-today-date (date &rest body)
>     "Run BODY with the `org-today' function set to return simply DATE.
>   DATE should be a date-time string (both date and time must be included)."
>     (declare (indent defun))
>     `(let ((day (date-to-day ,date))
>            (orig (symbol-function 'org-today)))
>        (unwind-protect
>            (progn
>              (fset 'org-today (lambda () day))
>              ,@body)
>          (fset 'org-today orig))))
> #+END_SRC

You should be able to simplify the macro body to

    `(cl-letf (((symbol-function 'org-today) (lambda () (date-to-day ,date))))
       ,@body)
-- 
Kyle