Types: Add Date type

Fixes jquery/api.jqueryui.com#194
Closes gh-445

Author: tjvantoll

pages/Types.html

@@ -73,6 +73,7 @@
     </ul>
   </li>
   <li class="toclevel-1"><a href="#PlainObject"><span class="toctext">PlainObject</span></a></li>
+  <li class="toclevel-1"><a href="#Date"><span class="toctext">Date</span></a></li>
   <li class="toclevel-1"><a href="#Function"><span class="toctext">Function</span></a>
     <ul>
       <li class="toclevel-2"><a href="#Arguments"><span class="toctext">Arguments</span></a></li>
@@ -421,6 +422,18 @@ <h2 id="PlainObject"> PlainObject </h2>
   jQuery.isPlainObject( o ); // true
 </code></pre>
 
+<h2 id="Date"> Date </h2>
+<p>The Date type is a JavaScript object that represents a single moment in time. Date objects are instantiated using their constructor function, which by default creates an object that represents the current date and time.
+</p>
+<pre><code data-lang="javascript">
+new Date();
+</code></pre>
+<p>To create a Date object for an alternative date and time, pass numeric arguments in the following order: year, month, day, minute, second, millisecond - although note that the month is zero-based, whereas the other arguments are one-based. The following creates a Date object representing January 1st, 2014 at 8:15.
+</p>
+<pre><code data-lang="javascript">
+new Date( 2014, 0, 1, 8, 15 );
+</code></pre>
+
 <h2 id="Function"> Function </h2>
 <p>A function in JavaScript can be either named or anonymous. Any function can be assigned to a variable or passed to a method, but passing member functions this way can cause them to be called in the context of another object (i.e. with a different "this" object).
 </p>