locale-date.module.ts

export class LocaleDateModule {
    options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
    constructor() { }

    getFutureDate(nextDay: number, locale: string, options: any): string {
        const today = new Date();
        const future = new Date(today);
        future.setDate(future.getDate() + nextDay);
        const string = new Date(future).toLocaleDateString(locale, options);
        console.log(string); // 17 Mayıs 2020 Pazar
        return string;
    }
    
    showDate() {
        return this.getFutureDate(15, 'tr-TR', this.options);
    }

}