after some other hours of trying, changing and debugging, I already know somthing more :-) when I change the timezone via the timezone-switcher, the timezone will be set to the new value, BUT at that time the date-time that I display on the page has already been converted (using the "old" timezone) and thus will not reflect the timezone change. when I refresh the page manually again, it is ok (which is of course an unreasonable demand to our webusers..). anyway, here is what I think, why this happens: when I press the button in my page, a POST request will be sent to the server (the action to execute is of course timezone.select). In the phases of the JSF lifecycle, the following will happen: * Apply Request Values Phase | timeZoneSelector.select event is queued (not executed) | * Process Validations Phase | s:convertDateTime will call its converter: DateTimeConverter, which will convert the date/time using the current time zone, which is of course still the "old" timezone | * Update Model Phase | the converted date/time from the last step is pushed to the model | the new TimeZone is pushed into model | * Invoke Application Phase | the queued event is now executed: | - from now on the new time zone is active | - TimeZoneSelector raises "org.jboss.seam.timeZoneSelected" event | * Render Response Phase | the page is rendered and the value of my date/time field is still that one calculated in the Process Validations Phase (with the old timezone) when I now refresh the page manually, the new timezone is already active and now the DateTimeConverter uses this new timezone and the calculated value will be displayed as expected. since I'm a newbie with all that JSF, SEAM, etc. stuff, I appreciate any coments on this.. following questions that are still open: * any ideas for a solution/workaround? how can I avoid that manually refreshing of the page | * who observes the "org.jboss.seam.timeZoneSelected" event?? I searched through all seam .java files, but couldn't find any observer? | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4112264#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...