Angular 2 runOutsideAngular still change the UI

Question

From my understanding of runOutsideAngular(), if I need to run something that won\'t trigger the Angular change detection, I need to use this function. My code is not workin

Answer 1

...
constructor(
        private ngZone: NgZone
){
    ngZone.runOutsideAngular(() => {
        setInterval(()=>{
            this.num= new Date().Format('yyyy-MM-dd HH:mm:ss');
        },1000);
    });
}
...