public RouteRef withLastUpdatedAt(java.util.Date lastUpdatedAt) {
        setLastUpdatedAt(lastUpdatedAt);
        return this;
    }
<p>
The Unix epoch timestamp in seconds for when the resource was last updated.
</p>

@param lastUpdatedAt
       The Unix epoch timestamp in seconds for when the resource was last updated.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-appmesh/src/main/java/com/amazonaws/services/appmesh/model/RouteRef.java