From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rasmus <rasmus@gmx.us>
Subject: Re: What is the best way to set #+DATE to today's date?
Date: Thu, 06 Aug 2015 19:41:33 +0200
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Kaushal <kaushal.modi@gmail.com> writes:

>> Why don't you just use a timestamp?
>
> But that would need me to insert the timestamp manually each time before
> exports

If you *always* want the current date you don't need to set date.

>> You can update whenever you want or using
>>    (org-insert-time-stamp (current-time))
>> at the right spot.
>
> Wouldn't that too need manual navigation to #+date: and then eval that
> elisp form?

Sure, but that's easy to find (untested): 

    (defun rasmus/update-date ()
      "update #+date keyword"
      (org-with-wide-buffer
       (let ((case-fold-search t))
         (goto-char (point-min))
         (search-forward-regexp "^#+date: ?")
         (delete-region (point) (line-end-position))
         (org-insert-time-stamp (current-time)))))

My point was that I don't understand the need for your today macro...

Rasmus

-- 
History is what should never happen again