Setting format and value in input type="date"

The format is YYYY-MM-DD. You cannot change it.

$('#myinput').val('2013-12-31'); sets value

new Date().toISOString().split('T')[0];

try this :)

function getDefaultDate(){

    var now = new Date();
    var day = ("0" + now.getDate()).slice(-2);
    var month = ("0" + (now.getMonth() + 1)).slice(-2);
    var today = now.getFullYear()+"-"+(month)+"-"+(day) ;

    return today;
}

$(document).ready(function(){ 
    $("#dateid").val( getDefaultDate()); 
});