<datepicker
    [(ngModel)]="item.updated"
    [expanded]="true"
    [viewFormat]="'DD/MM/YYYY'"
    (closed)='compareDates(item)'
></datepicker>
<datepicker
    [(ngModel)]="item.date_end"
    [expanded]="true"
    [viewFormat]="'DD/MM/YYYY'"
    (closed)='compareDates(item)'
></datepicker>

close() {
    this.opened = false;
    this.closed.emit();
}

<datepicker
    #datepick
    (click)="clicked(datepick, item)"  <-- this
    [(ngModel)]="item.date_end"
    [expanded]="true"
    [viewFormat]="'DD/MM/YYYY'"
    (closed)='compareDates(item)'
></datepicker>

clicked(el:DatePickerComponent, item: any){
   el.ngOnChanges();
}