code: @Override
      public <B extends Appendable> B format(final long millis, final B buf) {
          final Calendar c = newCalendar();
          c.setTimeInMillis(millis);
          return applyRules(c, buf);
      }
docs: /* (non-Javadoc)
  @see org.apache.commons.lang3.time.DatePrinter#format(long, java.lang.Appendable)