title: Difference between DateTimeOffset?(Nullable) and DateTimeOffset.Now
body: <p>How can I calculate the time between between a nullable DateTimeOffset? to DateTimeOffset.Now ? </p>
  
  <p>I need the result like "x day y hours ago"</p>
  
  <p>I started by doing something like this.</p>
  
  <pre><code>  var creationTime = //A nullable DateTimeOffset on Database    
    var difference = DateTimeOffset.Now.Subtract(creationTime);
  </code></pre>
  
  <p>But since creationTime is a nullable time, it gives me an error and I can't really find the difference.</p>