public com.google.protobuf.Timestamp getUpdateTime() {
      if (updateTimeBuilder_ == null) {
        return updateTime_ == null
            ? com.google.protobuf.Timestamp.getDefaultInstance()
            : updateTime_;
      } else {
        return updateTimeBuilder_.getMessage();
      }
    }
<pre>
The time when the operation result was last updated.
</pre>

<code>.google.protobuf.Timestamp update_time = 6;</code>

@return The updateTime.
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/OperationMetadata.java