title: In ASP.NET MVC RC3 with Razor - @String.Format("{0:hh:mm:ss}", timespan) errors - bug?
body: <p>The following errors with a FormatException:</p>
  
  <pre><code>&lt;td class="numeric"&gt;@String.Format("{0:hh:mm:ss}", testrun.ExecutionTime)&lt;/td&gt;
  </code></pre>
  
  <p>Where <code>ExecutionTime</code> is a TimeSpan. This format string is valid. Is this a bug or am I missing something obvious (given the late hour - the latter is probably it). </p>