Yes, I know it. But I don't think it can be used for my problem. I should have shown an example of the way I need to use it, it would have bean clearer. My EL expression is defined a resource file and then used with the messages built-in component : <h:outputText value="#{messages['el.demandeAbsence.resume']}" /> With my resource file like this : el.demandeAbsence.resume=Du #{da.lignes[0].dateDebut} au #{da.lignes[0].dateFin} So I don't see how I could use <s:convertDateTime> there. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4110856#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...