In Laravel 8 you can use the Date Casting: https://laravel.com/docs/8.x/eloquent-mutators#date-casting
In your Model just set:
protected $casts = [
'my_custom_datetime_field' => 'datetime'
];
And then in your blade template you can use the format()
method:
{{ $my_custom_datetime_field->format('d. m. Y') }}