Figured something out for what I required for now. I have a GeoRSS feed in a cluster. I wanted the cluster graphics to keep the records in order based on date. I used the clusterWeightFunction:public function myCalculateClusterWeightFunction(cluster:Cluster):void { var g:Array = cluster.graphics; g.sort(orderCluster); cluster.graphics = g; } private function orderCluster(a, b):int { var name1 = makeDate(a); var name2 = makeDate(b); if (name1 < name2) { return -1; } else if (name1 > name2) { return 1; } else { return 0; } } private function makeDate(input):int { // convert string date to a numeric date var result:int = 0; var ad:Array = input.name.split(" "); var x:String = ad[0].toString(); var d:String = ad[1].toString(); var m:String = ad[2].toString(); var y:String = ad[3].toString(); x = d + " " + m + " " + y; var date:Date = new Date(x); result = (date.fullYear * 10000) + (date.month * 100) + (date.date); return result; }