code: public static String format( DateTimeFormat format, TimeZone timeZone, Date date ) {
          return format.format( date, timeZone );
      }
docs: Format a date using the {@link DateTimeFormat} and {@link TimeZone} given in
  parameters
  
  @param format format to use
  @param timeZone timezone to use
  @param date date to format
  @return the formatted date