Hi
use this javascript method to convert the input from textbox to a valid Date Object
bdate = GetDateObject (elt.value);
var GetDateObject = function ( dateString){
var array = dateString.split('/');
var day = parseInt(array[0]);
var month = parseInt(array[1]);
var year = parseInt(array[2]);
var dateObject = new Date(year, month - 1, day);
return dateObject;
}