public Builder setDwellStartTime(com.google.protobuf.Timestamp.Builder builderForValue) {
        if (dwellStartTimeBuilder_ == null) {
          dwellStartTime_ = builderForValue.build();
        } else {
          dwellStartTimeBuilder_.setMessage(builderForValue.build());
        }
        bitField0_ |= 0x00000004;
        onChanged();
        return this;
      }
<pre>
The beginning time when a dwelling object has been identified in a zone.
</pre>

<code>.google.protobuf.Timestamp dwell_start_time = 3;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/OccupancyCountingPredictionResult.java