code: public static String toISO8601String(final Date date) {
  		if (date == null)
  			return StringUtils.EMPTY;
  
  		return new SimpleDateFormat(FORMAT_ISO_8601).format(date);
  	}
docs: Convert {@link java.util.Date} to {@link java.lang.String} representation in iso-8601 format.
  
  @param date
  original {@link java.util.Date}
  @return {@link java.lang.String}