public com.google.protobuf.ByteString getLatestWindowStartTimeBytes() {
      java.lang.Object ref = latestWindowStartTime_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        latestWindowStartTime_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
The latest time for the planned maintenance window to start.
This timestamp value is in RFC3339 text format.
</pre>

<code>optional string latest_window_start_time = 8;</code>

@return The bytes for latestWindowStartTime.
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/UpcomingMaintenance.java