add jquery ui plugin in your page.

 $("#txtDate").val($.datepicker.formatDate('dd M yy', new Date()));

jQuery dateFormat is a separate plugin. You need to load that explicitly using a <script> tag.

An alternative would be simple js date() function, if you don't want to use jQuery/jQuery plugin:

e.g.:

var formattedDate = new Date("yourUnformattedOriginalDate");
var d = formattedDate.getDate();
var m =  formattedDate.getMonth();
m += 1;  // JavaScript months are 0-11
var y = formattedDate.getFullYear();

$("#txtDate").val(d + "." + m + "." + y);

see: 10 ways to format time and date using JavaScript

If you want to add leading zeros to day/month, this is a perfect example: Javascript add leading zeroes to date

and if you want to add time with leading zeros try this: getMinutes() 0-9 - how to with two numbers?