issue when cloning jquery ui datepiker

What steps will reproduce the problem?
1. first i include jquery ui datepiker 
2. then i  datepiker 
$
('.datefield').datepicker({
                    dateFormat: 'yy/mm/dd',
                    maxDate: '-1',
                    changeMonth: true,
                    changeYear: true,
                });
3.then make function of jquery-dynamic form plugin 

$(document).ready(function(){
$("#duplicate").dynamicForm("#plus", "#minus",
{
limit:7,
createColor: 'yellow',
removeColor: 'red'
}
);
});

What is the expected output? What do you see instead?
datepiker not working 

What version of the product are you using? On what operating system?
jquery ui 1.8.19

Please provide any additional information below.
the form code is

<form method="post" id="myform" action="#">
    <fieldset>
        <legend>Education Information</legend>
        <ol>
            <li  id="duplicate">
            <input type="text" placeholder="Degree Type" />
            <input type="text" placeholder="Degree Name" />
            <input type="text" placeholder="Year Of Passing" class="datefield" readonly="readonly" />
            <input type="text" placeholder="Institute Name" />            <input type="text" placeholder="City" />
            <input type="text" placeholder="Country" />
                </li>
                    <a href="" id="plus">[+]</a>
                    <a href="" id="minus">[-]</a>
        </ol>
        </fieldset>
     </form>

Original issue reported on code.google.com by shujaata...@gmail.com on 16 May 2012 at 5:54

rajanrawal / jquery-dynamic-form

issue when cloning jquery ui datepiker #33