Error: Cannot assign type 'string' to type 'Moment'

I am presented with an object structured as follows:

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) {}
}

In one particular scenario, I need to fetch the date from a form, whereas in another situation where issues arise, I need to retrieve the system's date and use it in the new object being created (even though both dates are of type moment).

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;
    }

Despite my efforts, I cannot seem to resolve the issue in cases (1) and (2), and the reason behind this eludes me.

Answer №1

Both situations involve attempting to assign a string to the Newsletter.creationDate property, which should be set to a Moment object.

In scenario (1), one potential solution is to replace

moment().format(this.creationDate);
with moment(this.creationDate);. This adjustment is necessary because the .format() method in moment actually returns a string, as pointed out by @Julien Metral

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