How to control public shared content in Alfresco

ASPECT:"qshare:shared" 
ASPECT:"qshare:shared" AND @cm:creator:"ccl001"
ASPECT:"qshare:shared" AND @qshare:sharedBy:"ccl001"
ASPECT:"qshare:shared" AND @cm:modified:["2014-12-31" TO NOW]
ASPECT:"qshare:shared" AND @cm:modified:[MIN TO "2013-12-31"]

var nodes = search.luceneSearch('ASPECT:"qshare:shared"');
var count = 0;
for each(var node in nodes) {
        count = count + 1;
        logger.log(count + ": "+node.displayPath+"/"+node.name);           
        // Uncomment these two lines for unsharing
        //logger.log("  Cleaning the aspect..");    
        //node.removeAspect("qshare:shared");
        //node.save();
        //logger.log("  Done");                        
}

var today  = new Date();
var month = today.getMonth() + 1; //months from 1-12
var day     = today.getDate();
var year    = today.getFullYear();
var mydate = year+"-"+month+"-"+day;
var nodes = search.luceneSearch('ASPECT:"qshare:shared" AND @cm\\:to:"'+mydate+'"');
var count = 0;
for each(var node in nodes) {
  count = count + 1;
  logger.log(count + ": "+node.displayPath+"/"+node.name);
  logger.log(" This public url is expired --> "+node.properties["cm:to"]);
  logger.log(" Cleaning the aspect..");
  node.removeAspect("qshare:shared");
  //node.removeAspect("cm:effectivity");
  node.save();
  logger.log("Done");
}