public DBInstance withPreferredMaintenanceWindow(String preferredMaintenanceWindow) {
        setPreferredMaintenanceWindow(preferredMaintenanceWindow);
        return this;
    }
<p>
The weekly time range during which system maintenance can occur, in Universal Coordinated Time (UTC).
</p>

@param preferredMaintenanceWindow
       The weekly time range during which system maintenance can occur, in Universal Coordinated Time (UTC).
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/DBInstance.java