private void updateTextFieldFormat() {
        if( timeSpinner == null ) return;
        JFormattedTextField tf = ((JSpinner.DefaultEditor) timeSpinner.getEditor()).getTextField();
        DefaultFormatterFactory factory = (DefaultFormatterFactory) tf.getFormatterFactory();
        DateFormatter formatter = (DateFormatter) factory.getDefaultFormatter();
        // Change the date format to only show the hours
        formatter.setFormat( timeFormat );
    }