jQuery UI: Date Picker

Date Picker

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/themes/mint-choc/jquery-ui.css">
<p>Date:
    <input id="datepicker" type="text">
</p>

JavaScript

$("#datepicker").datepicker();
$("#datepicker").blur(function(){
    val = $(this).val();
    val1 = Date.parse(val);
    if (isNaN(val1)==true && val!==''){
        alert("error")
    }
    else{
    alert("ss")
        console.log(val1);
    }
});