From mboxrd@z Thu Jan  1 00:00:00 1970
From: pw <pw@riseup.net>
Subject: Re: modify postamble in html export
Date: Fri, 20 Sep 2013 15:17:48 +0200
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References: 87pps4ooia.fsf@ericabrahamsen.net
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To: eric@ericabrahamsen.net
Cc: emacs-orgmode@gnu.org

> You can override the whole thing by re-defining the `org-html-postable'
> variable. Set it to a function which returns the string you want:
>
> (defun my-org-html-postamble ()
>   (format "Last update : %s" (format-time-string "%d %b %Y")))
>
> (setq org-html-postamble 'my-org-html-postamble)
>
> I didn't test that, but something like that ought to work.

Thanks!

I tried to paste your code into my .emacs and I received the following 
error when publishing :

"org-html--build-pre/postamble: Wrong number of arguments: (lambda nil 
(format "Last update : %s" (format-time-string "%d %b %Y"))), 1"

I don't know where is the problem. I tried then to do the same by 
modifying the variable "Org Export HTML Postamble Format". The default 
format is :

'(("en" "<p class=\"author\">Author: %a (%e)</p>\n<p 
class=\"date\">Date: %d</p>\n<p class=\"creator\">%c</p>\n<p 
class=\"xhtml-validation\">%v</p>"))

So I changed it to (with the idea to change the string format (%s) later 
if working) :

'(("en"<p class=\"date\">Last update: %s</p>"))

(which add to my .emacs :  '(org-html-postamble-format (quote (("en" "<p 
class=\"date\">Last update: %s</p>"))))

But it does not change at all the postamble ""Created: 2013-09-19 jeu. 
14:09"".

So I'm stuck!
pw