public Builder clearStartTime() {
      bitField0_ = (bitField0_ & ~0x00000008);
      startTime_ = null;
      if (startTimeBuilder_ != null) {
        startTimeBuilder_.dispose();
        startTimeBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
The time at which the ScanRun started.
</pre>

<code>.google.protobuf.Timestamp start_time = 4;</code>
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1beta/src/main/java/com/google/cloud/websecurityscanner/v1beta/ScanRun.java