Collect value from a datepicker in Angular 5

I have the following datepicker

<mat-form-field>
    <input matInput [matDatepicker]="picker" placeholder="Hoy">
    <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
    <mat-datepicker #picker></mat-datepicker>
 </mat-form-field>

and I need to collect the value of the date to be able to store it later in a base de datos .