jsFiddle/Gist demo - jQuery UI DatePicker

fiddle.html

<div class="demo">

<p>Date: <input type="text" id="datepicker"></p>

</div>

fiddle.js

$(document).ready(function() {    
    var locale = 'en-GB';
    $.datepicker.setDefaults( {                     
                changeMonth: true,
                changeYear: true,
        } );
    $.datepicker.setDefaults( $.datepicker.regional[locale] ) 
    $('#datepicker').datepicker( );    
});

fiddle.manifest

name: jsFiddle/Gist demo - jQuery UI DatePicker
description: jsFiddle demo hosted on Gist using jQuery UI to display a popup calendar
authors:
  - Gary Smith
title:
  - JS Fiddle - jsFiddle/Gist integration demo - DatePicker
resources:
  - /js/empty.js
  - http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/themes/start/jquery-ui.css
  - https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.js
  - https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/i18n/jquery-ui-i18n.js
normalize_css: yes

...

http://jsfiddle.net/gh/gist/jquery/edge/1683877/