The org.apache.wicket.datetime.markup.html.form.DateTextField.forDatePattern( "id" , "yyyy-MM-dd" ); is not working on Opera 9.64 Tested in IE7, Firefox, Google chrome and ot works but not in opera This is tested with org.apache.wicket.extensions.yui.calendar.DatePicker Have tested different 1.4.x wicket releases. / Mathias