title: DateTime.Parse throws exception "not support in System.Globalization.GregorianCalendar"
body: <pre><code>string formatString = "MMddyyyyHHmmss";
  string sample = "20100611221912";
  DateTime dt = DateTime.ParseExact(sample, formatString, System.Globalization.CultureInfo.InvariantCulture);
  </code></pre>
  
  <p>the specific exception thrown is:</p>
  
  <p>System.FormatException: The DateTime represented by the string is not supported in calendar System.Globalization.GregorianCalendar.</p>