title: Date Time null model schema display swashbuckle + swagger ui
body: <p>I have implemented Swashbuckle and Swagger UI to do my API documentation.</p>
  
  <p>I'm having a problem with correctly displaying a nullable <code>DateTime</code>, or any nullable object for that matter.</p>
  
  <p>Currently a nullable <code>DateTime</code> displays as <code>"date": "2016-05-27T00:15:41.658Z"</code>in the response model schema.</p>
  
  <p>The response model displays the date as <code>date (string, optional)</code> which states that it's optional, but it also displays that for a non-nullable <code>DateTime</code>.</p>
  
  <p>I've tried to add default value via: <a href="https://stackoverflow.com/questions/28911023/default-model-example-in-swashbuckle-swagger">Default model example in Swashbuckle (Swagger)</a> and also tried to add a model schema example via the last answer.</p>
  
  <p>Any ideas on how I can get <code>"date": "null"</code> to display in the model schema? Or alternatively find a better way to give the person reading the documentation an indication that the <code>date</code> object can be null?</p>