public Builder clearScheduleTime() {
      bitField0_ = (bitField0_ & ~0x00000008);
      scheduleTime_ = null;
      if (scheduleTimeBuilder_ != null) {
        scheduleTimeBuilder_.dispose();
        scheduleTimeBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
The time when the task is scheduled to 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-v2/src/main/java/com/google/cloud/tasks/v2/Task.java