datepicker-config.html

<p>This datepicker input uses customized default values.</p>

<form class="form-inline">
  <div class="form-group">
    <div class="input-group">
      <input class="form-control" placeholder="yyyy-mm-dd"
            name="dp" [(ngModel)]="model" ngbDatepicker #d="ngbDatepicker">
      <div class="input-group-append">
        <button class="btn btn-outline-secondary calendar" (click)="d.toggle()" type="button"></button>
      </div>
    </div>
  </div>
</form>