code: public String unsetItem(String iid, List<String> properties)
        throws ExecutionException, InterruptedException, IOException {
      return unsetItem(iid, properties, new DateTime());
    }
docs: Unsets properties of a item. Same as {@link #unsetItem(String, List, DateTime)
  unsetItem(String, List&lt;String&gt;, DateTime)} except event time is not specified and
  recorded as the time when the function is called.