New exporter: no custom timestamps

[Giovanni Ridolfi <giovanni.ridolfi@yahoo.it>]

Hello everybody,

I am not able to export with custiom timestamps with the new exporter. 

file:
---------------------------
* [2012-09-17 lun]
** [2013-04-28 dom] sunday
* COMMENT s
# Local Variables:
# org-display-custom-times: t
# org-time-stamp-custom-formats: ("<%d/%m/%Y %A>" . "<%d/%m/%Y %A %H:%M>")
# End:
----------------------
If I open the file the local variables are set. I toggle the timestamp format 

C-c C-x C-t and C-c C-e H exports to HTML with my custom timestamp in
the headline:

<h2 id="sec-1"><span class="section-number-2">1</span> <span class="timestamp-wrapper"> <span class="timestamp">17/09/2012 lunedì</span></span></h2>

Whereas with the new exporter

M-x org-export-dispatch h H

I get the ISO format:
<h2 id="sec-1"><span class="section-number-2">1</span> <span class="timestamp-wrapper"><span class="timestamp">2012-09-17 lun</span></span></h2>

cheers,
Giovanni