Angular DatePipe with locale usage

I want to display the date in HTML depending on the set/used locale. For display purposes I want to display it in English or German – depending on the users decision. This means the user select the locale ‘de’ or ‘en’.

The default way to display the date is

 <span>{{ data.selDate | date: "mediumDate" }}</span>

According to the documentation I have {{ value_expression | date [ : format [ : timezone [ : locale ] ] ] }}. But this code won’t work

 <span>{{ data.selDate | date: "mediumDate" :'':"de-DE" }}</span>
 <span>{{ data.selDate | date: "mediumDate" :undefined:"de-DE" }}</span>

How to specify it in the DatePipe?

>Solution :

You need to import the additional locale’s

You can try:

component.html

<button (click)="switch('en-US')">Eng</button>
<button (click)="switch('de-DE')">Deu</button>

<span>{{ data.selDate | date: 'mediumDate':'': current }}</span>

app.module.ts

import { registerLocaleData } from '@angular/common';
import localeEn from '@angular/common/locales/en';
import localeDe from '@angular/common/locales/de';

registerLocaleData(localeDe);
registerLocaleData(localeEn);

component.ts

current: string = 'de-De';

switch(new: string): void {
  this.current = new;
}

NOTE: make sure selDate is a valid date

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