Ti.App.properties.setList() doesn't work :S

I'm building an app that has a RSS feed, the feed updates once a day, so of course I only need to update if this is the first time of if the cache is stale. I decided to work with Ti.App.property because it seemed like the obvious way to do this, I have a Data array and it's perfect for that. so I wrote the following code to do that:

if (Ti.App.Properties.hasProperty('tblData')){
    alert('hasProperty:true');
    if (parseInt(Ti.UI.currentWindow.appStartTime)-parseInt(Date.now)>=1){
        getData();
        alert('cache stale');
    }else{
        alert('cache current');
        reloadData();
    }
}
else{
    getData();
    alert('hasProperty:false');
}

Ti.App.Properties.setList('tblData', tblData);

anybody has a clue what's happening to my app's properties?