public Builder clearStartTime() {
          bitField0_ = (bitField0_ & ~0x00000001);
          startTime_ = null;
          if (startTimeBuilder_ != null) {
            startTimeBuilder_.dispose();
            startTimeBuilder_ = null;
          }
          onChanged();
          return this;
        }
<pre>
The start time of the accumulated count.
</pre>

<code>.google.protobuf.Timestamp start_time = 1;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/OccupancyCountingPredictionResult.java