Angular MatDatePicker with German language

I try to get German language in my MatDataPicker. But it stay in English. I work with Angular 18.2.10 and have installed @angular/material-moment-adapter#18.2 and moment#2.30.1.

This is my html:

<p>home works!</p>

<mat-form-field>
<input matInput [matDatepicker]="picker" placeholder="Choose a date" [formControl]="datePickerCtrl">
<mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
<mat-datepicker #picker></mat-datepicker>
</mat-form-field>


My ts file is:

import { Component } from '@angular/core';
import { DateAdapter, MAT_DATE_FORMATS, MAT_DATE_LOCALE } from '@angular/material/core';
import { FormControl, ReactiveFormsModule } from '@angular/forms';
import { MatInputModule } from '@angular/material/input';
import { MatDatepickerModule } from '@angular/material/datepicker';
import { MomentUtcDateAdapter, MY_FORMATS } from '../../../services/common/moment-utc-date-adapter';

@Component({
selector: 'app-home',
standalone: true,
imports: [
ReactiveFormsModule,
MatInputModule,
MatDatepickerModule
],
templateUrl: './home.component.html',
styleUrl: './home.component.scss',
providers: [
{ provide: MAT_DATE_LOCALE, useValue: 'de-DE' },
{ provide: MAT_DATE_FORMATS, useValue: MY_FORMATS },
{ provide: DateAdapter, useClass: MomentUtcDateAdapter },
]
})
export class HomeComponent {
datePickerCtrl = new FormControl();

constructor() {
this.datePickerCtrl.valueChanges.subscribe(x => {
console.log('date value changed', x);
})
}
}


And at the end my MomentUtcDateAdapter, written by Bruno Cerecetto and extended by a format for leading zeros, is:

import { Inject, Injectable, Optional } from "@angular/core";
import { MAT_DATE_LOCALE, MatDateFormats } from "@angular/material/core";
import { MomentDateAdapter } from '@angular/material-moment-adapter';
import { Moment } from 'moment';
import * as moment from 'moment';

@Injectable()
export class MomentUtcDateAdapter extends MomentDateAdapter {

constructor(@Optional() @Inject(MAT_DATE_LOCALE) dateLocale: string) {
super(dateLocale);
}

override createDate(year: number, month: number, date: number): Moment {
// Moment.js will create an invalid date if any of the components are out of bounds, but we
// explicitly check each case so we can throw more descriptive errors.
if (month < 0 || month > 11) {
throw Error(`Invalid month index "${month}". Month index has to be between 0 and 11.`);
}

if (date < 1) {
throw Error(`Invalid date "${date}". Date has to be greater than 0.`);
}

let result = moment.utc({ year, month, date }).locale(this.locale);

// If the result isn't valid, the date must have been out of bounds for this month.
if (!result.isValid()) {
throw Error(`Invalid date "${date}" for month with index "${month}".`);
}

return result;
}
}

export const MY_FORMATS: MatDateFormats = {
parse: {
dateInput: 'DD.MM.YYYY',
},
display: {
dateInput: 'DD.MM.YYYY',
monthYearLabel: 'MMM YYYY',
dateA11yLabel: 'LL',
monthYearA11yLabel: 'MMMM YYYY',
},
};


The result is: [![MatDatePicker][1]][1]

Why does it still show DEC as December instead of Dezember and why are the names of the days also the English abbreviation?

Best regards

Parascus [1]: https://i.sstatic.net/EDR7KFcZ.png

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