@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (valueCase_ == 1) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, value_);
    }
    if (valueCase_ == 2) {
      output.writeInt64(2, (long) ((java.lang.Long) value_));
    }
    if (valueCase_ == 3) {
      output.writeMessage(3, (com.google.type.DateTime) value_);
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Datetime type value.
</pre>

<code>.google.type.DateTime datetime_value = 3;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/FacetValue.java