@java.lang.Override
  public boolean hasWindowStartTime() {
    return ((bitField0_ & 0x00000004) != 0);
  }
<pre>
The current start time of the maintenance window.
This timestamp value is in RFC3339 text format.
</pre>

<code>optional string window_start_time = 6;</code>

@return Whether the windowStartTime field is set.
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/UpcomingMaintenance.java