title: Why value is not populated inside the input in mat datepicker?
body: <p>I have current template:</p>
  
  <pre><code>&lt;input type="text" class="form-control" name="my_date" 
          [matDatepicker]="myDatepicker" #myDate="ngModel"        
          [(ngModel)]="myDateValue" id="my_date" required&gt;                                        
      &lt;mat-datepicker-toggle [for]="myDatepicker"&gt;&lt;/mat-datepicker-toggle&gt;                                                                                
      &lt;mat-datepicker #myDatepicker&gt;&lt;/mat-datepicker&gt;  
  </code></pre>
  
  <p>The init happen when loading the component:</p>
  
  <pre><code>public myDateValue: string;
      this.myDateValue= myMonth.toString() + "\/" + myDay.toString() + "\/" + myYear.toString(); 
  </code></pre>
  
  <p>When printing the date to the console I get to see it in the FormControl
  value.
  But when the page load the date is not populate into the textbox?</p>
  
  <p>Any idea what I'm doing wrong ?
  Thanks.                                                                                     </p>