title: ion-datetime: How to get date value without timestamp?
body: <p>I'm using ion-datetime in ionic4 using NgModel to bind to a property, however, no matter what options I include in format, I always get the time with the timestamp included. ¿How can I remove timestamp from result so the final value of my property is something like "2019-04-22" instead of "2019-04-22T08:45:41.243-05:00"?</p>
  
  <p>I tried:  but, I'm still getting the timestamp</p>
  
  <pre><code> &lt;ion-datetime max="2030" min="2019" [(ngModel)]="mydate" display-format="MMM DD, YYYY"&gt;&lt;/ion-datetime&gt;
  </code></pre>
  
  <p>I expect the result to be like: "2019-04-22", but I keep getting: "2019-04-22T08:45:41.243-05:00"</p>