valid dd/mm format switch sides after manual input on datepicker field

Bug, feature request, or proposal:

Bug

What is the expected behavior?

That the valid dd/mm/yyyy inputed date remains as it is, not matter what, they always switch sides on change.

What is the current behavior?

E.g.: 03/02/1990 becomes 02/03/1990.

What are the steps to reproduce?

Set a custom locale like Brasil:

// location
import localePt from '@angular/common/locales/pt';
import localePtExtra from '@angular/common/locales/extra/pt';

registerLocaleData(localePt, 'pt', localePtExtra);

Then try to use the datepicker with manual input.

What is the use-case or motivation for changing an existing behavior?

Because it works very well with the Angular locale config, there’s just this switch bug that does not work properly.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

{
    "@angular/core": "^6.0.6",
    "@angular/material": "^6.3.0",
}

Is there anything else we should know?

UI input:

Manual input:

~I really don’t wanna use moment.js~

---

It seems like the StackBlitz example isn’t wroking as well: https://stackblitz.com/angular/vnvbdjykmve?file=app%2Fdatepicker-locale-example.ts

[benjamincharity]

I definitely stole most of this from some SO answer and haven’t cleaned it up, but it does seem to work.

https://gist.github.com/benjamincharity/46cdcb1155b4945ed95495780c67787e

The format function is the one you really want.

[Giocapetini]

@odahcam https://github.com/manfredsteyer/angular-material-custom-date-adapter/blob/master/src/app/shared/custom-date-adapter.ts (manfredsteyer is the same guy who made angular-oauth2-oidc)

https://blog.angular.io/taking-advantage-of-the-angular-material-datepicker-237e80fa14b3

https://medium.com/@esanjiv/working-with-custom-dateadapter-for-angular-material-2-datepicker-76d4446277dc