public com.google.protobuf.Timestamp.Builder getStartTimeBuilder() {
      bitField0_ |= 0x00000004;
      onChanged();
      return getStartTimeFieldBuilder().getBuilder();
    }
<pre>
Time when the request was received.
</pre>

<code>.google.protobuf.Timestamp start_time = 3;</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1beta2/src/main/java/com/google/cloud/videointelligence/v1beta2/VideoAnnotationProgress.java