// html code
<input id="idFdate" type="date" />
// javascript code on main load function
function loadFunction() {
// body...
var today = new Date();
var dd = today.getDate();
var mm = today.getMonth()+1; //January is 0!
var yyyy = today.getFullYear();
if(dd<10){
dd='0'+dd;
}
if(mm<10){
mm='0'+mm;
}
today = yyyy+'-'+mm+'-'+dd;
document.getElementById("idFdate").defaultValue =today+"";
}