title: Convert datetime ticks(String.Format("{0:D19}", DateTime.MaxValue.Ticks - DateTime.UtcNow.Ticks) to datetime
body: <p>I am storing Azure table storage rowkey in date time ticks format </p>
  
  <pre><code>String.Format("{0:D19}", DateTime.MaxValue.Ticks - DateTime.UtcNow.Ticks);
  </code></pre>
  
  <p>and I want to convert back to date time.</p>