title: Type 'string' is not assignable to type 'Moment' error
body: <p>I have an object like this:</p>
  
  <pre><code>import { Moment } from 'moment';
  
  export interface INewsletter {
      id?: number;
      creationDate?: Moment;
      email?: string;
  }
  
  export class Newsletter implements INewsletter {
      constructor(public id?: number, public creationDate?: Moment, public email?: string) {}
  }
  </code></pre>
  
  <p>In one place I need to get the date from the form I'm using, but in the second case that is giving me the problem, I just need to get the date from the system and use it in the new created object (without the error, that I do not understand since the date is also a moment).</p>
  
  <pre><code>import { Component, OnInit } from '@angular/core';
  import { ActivatedRoute } from '@angular/router';
  import { HttpResponse, HttpErrorResponse } from '@angular/common/http';
  import { Observable } from 'rxjs';
  import * as moment from 'moment';
  import { DATE_TIME_FORMAT } from 'app/shared/constants/input.constants';
  
  import { INewsletter } from 'app/shared/model/newsletter.model';
  import { NewsletterService } from '../../entities/newsletter/newsletter.service';
  
  @Component({
      selector: 'jhi-footer',
      templateUrl: './footer.component.html'
  })
  export class FooterComponent implements OnInit {
      newsletter: INewsletter;
      isSaving: boolean;
      creationDate: string;
  
      constructor(private newsletterService: NewsletterService, private activatedRoute: ActivatedRoute) {}
  
      ngOnInit() {
          this.isSaving = false;
          this.creationDate = moment().format(DATE_TIME_FORMAT);
          this.newsletter = new Object(); 
  (1)     this.newsletter.creationDate = moment().format(this.creationDate); 
  (2)     this.newsletter.creationDate = this.creationDate;
      }
  </code></pre>
  
  <p>So, in both cases (1) and (2) I can not make it work and I do not understand why.</p>