title: How do I get elapsed time in milliseconds in Ruby?
body: <p>If I have a <code>Time</code> object got from :</p>
  
  <pre><code>Time.now
  </code></pre>
  
  <p>and later I instantiate another object with that same line, how can I see how many milliseconds have passed? The second object may be created that same minute, over the next minutes or even hours.</p>