Date differens

Hello. I need to get the differens between two when choosing from a picker. This is my code:

var pickValue = 0;
picker.addEventListener('change',function(e)
{    
 
     pickValue = new Date(e.value);  
 
     pickValueMonth = pickValue.getMonth()+1;
 
     pickValue = pickValue.getHours()+":"+pickValue.getMinutes()+" - "+pickValue.getDate()+" "+monthNames[pickValueMonth];
 
});

An example for this would be something like this:

var dateDifferens = (((pickValue.getTime()-xxxValue.getTime())/1000)/3600)/24;

But because im using a picker i only have one variable ... PLS help! :) I have already looked in date.js ...

To get picker work on both platforms, do this:

picker.addEventListener('change', function(e) {
    this.value = e.value;
});
 
picker.getValue = function() {
    return this.value;
};

To get date difference (and "picker.getValue" will return "Date" instance), use minus operator:

var dateDiff = picker2.getValue() - picker1.getValue();

Someone? Maybe little help with some code? I'm really stuck here ...