Changing a Work Item Status based on the result of a Date Comparison

The requirement is: Change the Work Item Status to 'Locked', when the Work Item Load Date is less than Today's Date. I have created work items were the Load Date is less than today's date but the status still won't change. In addition, is there anyway of applying this logic to all Work Items on a daily basis?

Can anyone help?

I read over the following article:
http://www.ibm.com/developerworks/rational/library/rational-team-concert-calculated-fields-work-item/

Here is my javascript:

dojo.provide("com.mycomp.javascript.Test_loadDateCrossed");
dojo.require("com.ibm.team.workitem.api.common.WorkItemAttributes");
dojo.require("dojo.date");
dojo.require("dojo.date.stamp");
 
(function() {

    dojo.declare("com.mycomp.javascript.Test_loadDateCrossed", null, {
 
    getValue: function(attribute, workItem, configuration) {
 
        try {
            var WorkItemAttributes = com.ibm.team.workitem.api.common.WorkItemAttributes;
            var workItemType = (workItem.getValue(WorkItemAttributes.TYPE));
                 
                 
              if( workItemType == "Test" )
            {
                  var Status = workItem.getValue(WorkItemAttributes.STATE);          
                 
                 //Figure out the LoadDate and then clean it up
                  var loadDate = workItem.getValue(WorkItemAttributes.DUE_DATE);
                  //Remove Dashes from the Load Date
                  var loadDateNoDashes = loadDate.replace(/-/g, "");
                  //Remove the last 14 characters from Load Date leaving us with the format: YYYYMMDD
                  var loadDateNoDashesNoTime = loadDateNoDashes.slice(0,-14);
                 
                 
                  //Figure out the current date or Today's Date
                  var currentDate = new Date();
                                  var dd = currentDate.getDate();
                                  var mm = currentDate.getMonth+1();
                                  var yyyy = currentDate.getFullYear();
                 
                  if(dd<10) {
                    dd='0'+dd
                    }
                 
                  If(mm<10) {
                    mm='0' +mm
                    }
                 
                            currentDate = yyyy+mm+dd;
                 
                 
                  //Compared the Test Date against Today's Date
                  If (loadDateNoDashesNoTime < currentDate)
                  {
                      Status = com.ibm.team.workitem.TestWorkflow.state.s2; //This is the "Lock" ID.
                      return Status;
                  }
            }      
        catch(err) {
            var txt;
            txt="There was an error on this page.\n\n";
            txt+="Error description: " + err.message + "\n\n";
            txt+="Click OK to continue.\n\n";
            alert(txt);