public void setStartAt(java.util.Date startAt) {
        this.startAt = startAt;
    }
<p>
The Epoch timestamp at which the Auto-Tune maintenance schedule starts.
</p>

@param startAt
       The Epoch timestamp at which the Auto-Tune maintenance schedule starts.
aws-java-sdk-opensearch/src/main/java/com/amazonaws/services/opensearch/model/AutoTuneMaintenanceSchedule.java