title: How do I convert DateTime .NET datatype to W3C XML DateTime data type string and back?
body: <p>I have a <code>System.DateTime</code> object and I need to convert it into a string storing that datetime in W3C XML DateTime format (yyyy-mm-ddThh:mm:ssZ) and then be able to convert the resulting string back into <code>System.DateTime</code>.</p>
  
  <p>Is there something ready for that in .NET or do I have to implement it myself?</p>