From mboxrd@z Thu Jan  1 00:00:00 1970
From: Scott Randby <srandby@gmail.com>
Subject: Re: html preamble
Date: Tue, 24 Mar 2015 11:19:06 -0400
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On 03/23/2015 04:12 PM, hymie! wrote:
> So my next task is to learn about the HTML preamble.
>
>>From reading the docs, it looks like all of my org files have to share a
> single HTML preamble, which is set in my .emacs file through either the
> org-html-preamble variable, the org-html-preamble-format variable, or the
> org-publish-project-alist variable.  There is no way to tell a specific Org
> file "This is your HTML preamble."  Is that correct?
>
> Why are there two different variables org-html-preamble-format and
> org-html-preamble if the org-html-preamble variable can perform all of the
> tasks of org-html-preamble-format and more?
>
> Finally, how do I get the current date into the preamble?  I see that I can
> specifically set a date, and I see the current date in a comment at the top
> of my exported HTML, but I can't figure out how to get the current date out
> of the comment and into my preamble.
>

I don't know if this helps, but I have postamble requirements in each 
file that I export. I believe you can do the same for the preamble. 
Below is an example from one of my files.

----
* COMMENT Postamble Settings

#+BEGIN_SRC emacs-lisp

;; Turn off postamble creation
(setq org-html-postamble nil)

;; Turn on postamble creation (default)
(setq org-html-postamble t)

;; Postamble format for lessons
(setq org-html-postamble-format (quote (("en" "<p 
class=\"author\">Author: %a </p>
<p class=\"email\">Email: %e</p>
<p class=\"creator\">%c</p>"))))

;; Postamble format for non-lesson pages (default)
(setq org-html-postamble-format (quote (("en" "<p 
class=\"author\">Author: %a </p>
<p class=\"email\">Email: %e</p>
<p class=\"date\">Date: %T</p>
<p class=\"creator\">%c</p>"))))

#+END_SRC
----

Scott Randby