Problem replacing content in text frame

#targetengine "session"
//Creates a simple event listener.
main();
function main(){
    var myEventListener = app.addEventListener("beforePrint", dateChanges, false);
    var myEventListener = app.addEventListener("beforeSave", dateChanges, false);
    //var myEventKill = app.addEventListener("beforeClose", killDate, false);
}
///////////////////////////////////////////////
function dateChanges(){
     var myDocument = app.activeDocument;
var myPageItems = myDocument.pageItems.item("myDateLabel");
if(myPageItems==myPageItems){
if(myPageItems.getElements().length != 0){
    //alert ("I want to change your date")
    var myDateText=myPageItems
var myDate=new Date();
    myDate=String(myDate);
    myDate=myDate.slice(0,15);
    myDate=myDate.slice(4,15);
    alert(myDateText);
    with(myDateText.parentStory.words.itemByRange(2,4)){
                    contents=(    ""+myDate)
            }
        }
    }
}//ending bracket for dateChanges function
function killDate(){
app.removeEventListener("beforePrint", dateChanges, false);}

this is an event listner that changes the date. This works when I use myDateText.parentStory when I plug it in to the other script i am using same stuff. it doesn't work its object is also listed as a page item.