title: Timezone offset not working in angular js date expression
body: <p>I have <code>2016-10-21T13:47:02.922452</code> as ISO string from backend server.
  My timezone is +0530 GMT i.e Offset is +530 (ahead of GMT).</p>
  
  <p>When i use angular date expression like this</p>
  
  <p><code>{{'2016-10-21T13:47:02.922452'| date:'medium':'+530'}}</code></p>
  
  <p><strong>I expected output to be = Oct 21, 2016 7:17:02 PM 
  but it prints 
  Oct 21, 2016 1:47:02 PM instead.</strong></p>
  
  <p>I am confused for what am i doing wrong here. </p>