title: How to convert DateTime in UTC format?
body: <p>I have time in this format and I want to convert this into <code>UTC</code> timezone.</p>
  
  <pre><code> : "2015-03-17T07:46:52+0100"
   : "yyyy-MM-dd'T'HH:mm:ssZ"
  </code></pre>
  
  <p>I am using Codeigniter framework.</p>