[galaxy-dev] Printing the current date in a param value

Hello Is there a way to do something like this ? <param name="dateAnalyse" format="txt" type="text" size="25" value="${time.strftime('%Y_%m_%d')}" label="Date de l'analyse" help="15/01/2012" optional="True"/> I would like to set a kind of default value to my param. ${time.strftime('%Y_%m_%d')} is not interpreted. I have tried this because it works within the label attribute in <data> tag (for labeling my output) But it does not work for the label attribute (neither value attribute) in <param> tab. thank you. Fred