title: Datetime string formatting and CultureInfo
body: <p>I was suprised to see FxCop complaining that I wasn't specifying a CultureInfo in the following:</p>
  
  <pre><code>string s = day.ToString("ddd");
  </code></pre>
  
  <p>Surely the format string param in <code>ToString</code> is completely independent of <code>CultureInfo</code>? Is there any way which <code>CultureInfo</code> could affect the returned string?</p>
  
  <p><strong>EDIT:</strong> sorry, this is a total fail of a question. It's obvious that <code>"ddd"</code> should be dependent on culture settings. I was really thinking more of a case like <code>DateTime.Now.ToString("dd-MM-yy")</code>, but it looks like FxCop doesn't in fact complain in that instance.</p>