title: Convert one timezone to another in javascript
body: <p>I'm looking for a function that receives a time, source timezone 
  and a destination
  and returns time in the destination timezone</p>
  
  <p>timezones are in the following format:
  'utc', 'est', 'edt', 'gmt', ...</p>
  
  <pre><code>function convertTime(time,fromZone,toZone){
     // do conversion
     return convertedTime;
  }
  </code></pre>