From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nick Dokos <ndokos@gmail.com>
Subject: Re: What is the best way to set #+DATE to today's date?
Date: Thu, 06 Aug 2015 14:12:07 -0400
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Kaushal <kaushal.modi@gmail.com> writes:

> Hi all,
>
> There are quite few documents in which I want to update the date stamp to the last update time.
>
> I like that #+DATE keyword value is used aptly in latex/pdf and html exports.
>
> But I couldn't find an elegant way for that date to be updated to today's (last updated) date.
>
> I came up with the below. But please let me know if there's an inbuilt way to do the same.
>
> PART 1: Config in init.el
>
>     ;; Update TODAY macro with current date
>     (defun modi/org-update-TODAY-macro (&rest ignore)
>       "Update TODAY macro to hold string with current date."
>       (interactive)
>       (when (derived-mode-p 'org-mode)
>         (save-excursion
>           (goto-char (point-min))
>           (while (re-search-forward
>                   "^\\s-*#\\+MACRO:\\s-+TODAY"
>                   nil 'noerror)
>             (forward-line 0)
>             (when (looking-at ".*TODAY\\(.*\\)")
>               (replace-match
>                (concat " "
>                        (format-time-string "%b %d %Y, %a" (current-time)))
>                :fixedcase :literal nil 1))))))
>     (add-hook 'org-export-before-processing-hook #'modi/org-update-TODAY-macro)
>
> PART 2: org document where I want the #+DATE to auto update
>
>     #+MACRO: TODAY [current date is auto-inserted when exporting]
>     #+DATE: {{{TODAY}}}
>

There is a built-in-macro - try e.g.

#+DATE: {{{time(%Y-%m-%d)}}}

See

        (info "(org) Macro replacement")
-- 
Nick