public com.google.protobuf.Timestamp.Builder getScheduleTimeBuilder() {
      bitField0_ |= 0x00000010;
      onChanged();
      return getScheduleTimeFieldBuilder().getBuilder();
    }
<pre>
The time when the task is scheduled to be attempted.

For App Engine queues, this is when the task will be attempted or retried.

`schedule_time` will be truncated to the nearest microsecond.
</pre>

<code>.google.protobuf.Timestamp schedule_time = 4;</code>
java-tasks/proto-google-cloud-tasks-v2beta3/src/main/java/com/google/cloud/tasks/v2beta3/Task.java