ngModel make datePicker date of today return null

My date picker is set default to today, which benefit the status of what my code is running at the moment. I want to be able to pass the value of it so I use ngModel and it make my datePicker null. I found that ngInit can hard code default value but the problem is I don't know what represent dateTime.Now in ngInit.

<mat-form-field>
  <mat-label>Angular forms</mat-label>
  <input matInput [matDatepicker]="picker1" [formControl]="date" [(ngModel)]="datePicker">
  <mat-datepicker-toggle matSuffix [for]="picker1"></mat-datepicker-toggle>
  <mat-datepicker #picker1 [(ngModel)]="datePicker"></mat-datepicker>
</mat-form-field>