How can I display date and time in Angular template and keep it updated?

Question

I need to display date and time in my angular template, and keep it updated, so when time is changed to show changed time ofcourse, application SHOULD look like this:

this is my .html template code:

<div class="top-right pull-right">
  <button type="button" class="btn xbutton-rectangle" (click)="logOut()">
    <div class="icon-user pull-left">
      <i class="fas fa-user fa-fw"></i>
      <span class="button-text">{{employee.FullName}}</span>
    </div>
    <div class="time-date pull-right">
      <p class="button-time">08:55</p>
      <p class="button-date">22.06.2018</p>
    </div>
  </button>
</div>

My .ts file:

@Component({
  selector: 'main-screen',
  templateUrl: './main-screen.component.html',
  styleUrls: ['./main-screen.component.css']
})
export class MainScreenComponent implements OnInit {

  constructor() {
  }

  ngOnInit() {
    //.. some methods 
  }

  ngOnDestroy() {
    this.ngUnsubscribe.next();
    this.ngUnsubscribe.complete();
  }

  logOut() {
    this._globals.isAuthenticated = false;
    this._globals.loggedInUser = null;
    this._globals.token = null;
  }

} 

So how can I display date and time? and keep it updated when system date&time changes?

Solution 1

All you need to do is use the setInterval on your constructor

  date:Date; 
  constructor(){
    setInterval(() => {
      this.date = new Date()
    }, 1000)
  }

And use the date pipe to format the date and time

{{date   | date: "mm-dd-yyyy"}}
{{date   | date: "HH:mm:ss"}}

Demo

Solution 2

You should assign a variable to the date and update it every 0.1 second for example

public today = Date.now();

 setInterval(() => {
      this.today = Date.now();
    }, 100);

You can display it in your html like this if you want hours and minutes for example:

{{today | date:'HH:mm' }}

Look at https://angular.io/api/common/DatePipe for other Date format