main.ts

import {Component} from 'angular2/core';
import {bootstrap} from 'angular2/platform/browser';
import {Observable} from 'rxjs/Rx';
@Component({
    selector: 'app',
    template: `
    {{clock | async | date:'medium'}}    
`
})
export class App {
    clock = Observable
        .interval(1000)
        .map(()=> new Date());
}
bootstrap(App);