title: Save TimeZone with Date in mongodb
body: <p>I have java.util.Date field in my document class.</p>
  
  <p>E:g:</p>
  
  <pre><code>@Document(collection = "testdoc")
  public class TestDoc {
      @Id
      String id;
      Date startDate;
  }
  </code></pre>
  
  <p>Even if I set the Date with UTC and IST, it always save in my collection as below,</p>
  
  <pre><code> "startDate" : ISODate("2015-08-21T18:30:00.000Z")
  </code></pre>
  
  <p>How can I save the time zone also in mongo collection? What does Z stand in this case?</p>