How to change angular material datepicker format

No need to use MomentDateAdapter!

Here's my solution with the least amount of code and using the MAT_NATIVE_DATE_FORMATS.

1. Declare your own date formats

import { MatDateFormats, MAT_NATIVE_DATE_FORMATS } from '@angular/material';

export const GRI_DATE_FORMATS: MatDateFormats = {
  ...MAT_NATIVE_DATE_FORMATS,
  display: {
    ...MAT_NATIVE_DATE_FORMATS.display,
    dateInput: {
      year: 'numeric',
      month: 'short',
      day: 'numeric',
    } as Intl.DateTimeFormatOptions,
  }
};

2. Use them

@Component({
  selector: 'app-vacation-wizard',
  templateUrl: './vacation-wizard.component.html',
  styleUrls: ['./vacation-wizard.component.scss'],
  providers: [
    { provide: MAT_DATE_FORMATS, useValue: GRI_DATE_FORMATS },
  ]
})

Don't forget to set the appropriate language!

constructor(private readonly adapter: DateAdapter<Date>) {}
this.adapter.setLocale(this.translate.currentLang);

That's all!

import { DateAdapter, MAT_DATE_FORMATS, MAT_DATE_LOCALE } from '@angular/material';
import { MomentDateModule, MomentDateAdapter } from '@angular/material-moment-adapter';

 export const DateFormats = {
            parse: {
                dateInput: ['YYYY-MM-DD']
            },
            display: {
                dateInput: 'YYYY-MM-DD',
                monthYearLabel: 'MMM YYYY',
                dateA11yLabel: 'LL',
                monthYearA11yLabel: 'MMMM YYYY',
            },
        };

    providers: [

        { provide: DateAdapter, useClass: MomentDateAdapter, deps: [MAT_DATE_LOCALE] },
          { provide: MAT_DATE_FORMATS, useValue: DateFormats }

      ],

add above code in your app.module. it is working perfectly for me.

You need to provide an object containing the formats you wish to use. The object should look something like:

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

You then need to add that in to your providers array, like so:

  import { MAT_DATE_FORMATS } from '@angular/material/core';
  import { MomentDateAdapter } from '@angular/material-moment-adapter';

  //...

  providers: [
    {provide: DateAdapter, useClass: MomentDateAdapter, deps: [MAT_DATE_LOCALE]},
    {provide: MAT_DATE_FORMATS, useValue: MY_FORMATS},
  ],

Here is a StackBlitz demo to show it working