title: Set DateTime in App.Config
body: <p>I have a service that needs to receive configuration from APP config to make it easier to update when you need to change the search criterias - for example if error occurs.
  so, saying that I would like to know how to set a Datetime value in app.config</p>
  
  <p>I want something like:</p>
  
  <pre><code>&lt;add key="MyDate" value="DateTime.Now" /&gt;
  </code></pre>