Ionic2 date popup with current date

If you are using ngModel to save date value, set it to current date at component constructor.

 <ion-datetime [(ngModel)]="dateVariable"></ion-datetime>

@Component({
    selector: 'page-example',
    templateUrl: 'example.html'
})
export class ExamplePage {
    dateVariable: string;

    constructor(){
        this.dateVariable : new Date().toISOString();
    }