title: Change the browser's Date/time value using chrome extension
body: <p>I'm looking for a way to change the value returned from javascript's <code>new Date()</code> function.<br>
  In general - I'm looking for a way to write an extension that will give the user the ability to set his timezone (or diff from the time of his system's clock) without changing time/timezone on his computer.</p>
  
  <p>I checked the <a href="https://developer.chrome.com/extensions/api_index" rel="noreferrer">chrome extension api</a> but found nothing there. Will appreciate it if someone can point me at the right direction.</p>