title: how to convert calendar object to a specific time zone
body: <p>I am getting date from database from time-zone A (dBDate) and I am getting the current date from my android device I am currently using in time-zone B (deviceNowDate), I need to find the difference between the 2 dates in milli seconds so I think I should convert both of these dates to 1 hardcoded timezone (say timezone C) and then find the difference. How do I convert both of these dates to another time zone? </p>
  
  <p>They are calendar objects.</p>
  
  <pre><code>dbDate.setTimeZone();
  </code></pre>
  
  <p>will this change the time zone and also convert the date/time for me?</p>