comment.component.html

<div fxLayout="column" fxLayoutAlign="center" fxLayoutGap="10">
  <ol class ="ol">
    <li *ngFor="let comment of comments">
      <mat-card>
        <mat-card-content>
          <h3>{{comment.subject}}</h3><br>

         {{comment.body}}
        </mat-card-content>
        <mat-card-footer>
          <div class="date">
           <i> {{comment.creationTimestamp | date:'dd-MM-yyyy HH:mm:ss' : format}} </i>
         </div>
         </mat-card-footer>
      </mat-card><br>
    </li>
  </ol>
</div>

<button mat-raised-button color="primary" (click)="goBack()">Back</button>