@java.lang.Override
  public com.google.protobuf.TimestampOrBuilder getStartTimeOrBuilder() {
    return startTime_ == null ? com.google.protobuf.Timestamp.getDefaultInstance() : startTime_;
  }
<pre>
Start of the time interval (inclusive) during which the trace data was
collected from the application.
</pre>

<code>.google.protobuf.Timestamp start_time = 5;</code>
java-trace/proto-google-cloud-trace-v1/src/main/java/com/google/devtools/cloudtrace/v1/ListTracesRequest.java