sharepoint 2010 - How can I sort my Jquery dropdownlist by date created? -

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i have sharepoint dropdown need ordered date created. code have far tried simple jquery: 

function dashboardreport(a, b) {     return new date(a.created).gettime() - new date(b.created).gettime(); }

this html sharepoint dropdown want re-order: 

    <sharepoint:formfield runat="server" id="ff1753" controlmode="new" fieldname="dashboardreport" __designer:bind="{ddwrt:databind('i','ff1753','value','valuechanged','id',ddwrt:escapedelims(string(@id)),'@dashboardreport')}" />


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