ows how you can check for mutations to a Date object even though the identity of the object
has not changed.</p>
<p>

<div>
  <plnkr-opener example-path="examples/example-doCheckDateExample"></plnkr-opener>

  <div class="runnable-example"
      path="examples/example-doCheckDateExample"
      name="doCheckDateExample"
      module="do-check-module">

  
    <div class="runnable-example-file" 
      name="app.js"
      language="js"
      type="js">
      <pre><code>angular.module(&#39;do-check-module&#39;,