public Builder setUpdateTime(com.google.protobuf.Timestamp.Builder builderForValue) {
      if (updateTimeBuilder_ == null) {
        updateTime_ = builderForValue.build();
      } else {
        updateTimeBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000004;
      onChanged();
      return this;
    }
<pre>
The last update time of the operation.
</pre>

<code>.google.protobuf.Timestamp update_time = 3;</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/ExportDataMetadata.java