Modify date in org-mode html export

Question

I use org-mode to create a website with the html export (publish) feature.

I want to have a postamble in html with just the date (in a certain format and without hours).

Precisely, I want to have "Last update : 20 sept. 2013" at the end of my html page. And, of course, I need relative date which change according days.

I tried to achieve this by putting this code into my .emacs :

'(org-html-postamble t)
'(org-html-postamble-format (quote (("en" "Last update : %d"))))

But the result is "Last update: " without the date.

Please tell me what I have to change into my .emacs or explain precisely another way of doing this.

Answer 1

Found a solution (thanks to org-mode mailing-list).

Paste this code into .emacs :

(defun my-org-html-postamble (plist)
 (format "Last update : %s" (format-time-string "%d %b %Y")))
(setq org-html-postamble 'my-org-html-postamble)