code: public final String formatFinish(Format format) {
          if (format != null) {
              Long minFinish = interval.getMinFinish();
              if (minFinish != null) {
                  return format.format(minFinish);
              } else {
                  return null;
              }
          } else {
              Long minFinish = interval.getMinFinish();
              if (minFinish != null) {
                  return numberFormat.get().format(minFinish);
              } else {
                  return null;
              }
          }
      }
docs: Uses the given <code>Format</code> to format the finish of this
  parameter's interval.
  
  @param format a <code>Format</code> object.
  @return the finish of this parameter's interval as a formatted
  <code>String</code>.