private com.google.protobuf.SingleFieldBuilderV3<
            com.google.protobuf.Timestamp,
            com.google.protobuf.Timestamp.Builder,
            com.google.protobuf.TimestampOrBuilder>
        getExecutionTimeFieldBuilder() {
      if (executionTimeBuilder_ == null) {
        executionTimeBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.protobuf.Timestamp,
                com.google.protobuf.Timestamp.Builder,
                com.google.protobuf.TimestampOrBuilder>(
                getExecutionTime(), getParentForChildren(), isClean());
        executionTime_ = null;
      }
      return executionTimeBuilder_;
    }
<pre>
The time to execute the event. If you set
[execute_now][google.cloud.video.livestream.v1.Event.execute_now] to
`true`, then do not set this field in the `CreateEvent` request. In
this case, the server schedules the event and populates this field. If you
set [execute_now][google.cloud.video.livestream.v1.Event.execute_now] to
`false`, then you must set this field to at least 10 seconds in the future
or else the event can't be created.
</pre>

<code>.google.protobuf.Timestamp execution_time = 10;</code>
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/Event.java