Repository: flutter
Issue: MaterialLocalizations has incorrect compact date pattern (d/M/y format instead of dd/MM/y format)
Labels: framework,f: material design,a: internationalization,has reproducible steps,P2,team-design,triaged-design,found in release: 3.19,found in release: 3.21

It seems that the date pattern is wrong. It uses d/M/y instead of dd/MM/y.

Comparing the entry with key 'it' for the datePatterns map in the file packages/flutter_localizations/lib/src/l10n/generated_date_localizations.dart and the one in the intl project pkgs/intl/lib/date_time_patterns.dart, there are the following differences (flutter on the right, intl on the left):

'Md': 'd/M' -> 'Md': 'dd/MM'
'MEd': 'EEE d/M' -> 'MEd': 'EEE dd/MM'
'yM': 'M/y' -> 'yM': 'MM/y'
'yMd': 'd/M/y' -> 'yMd': 'dd/MM/y'
'yMEd': 'EEE d/M/y' -> 'yMEd': 'EEE dd/MM/y'

The correct format should be the one from the intl library.

### Steps to reproduce

1. Create a Flutter project.
2. Add flutter_localizations to pubspec
3. Set the app's supported locale to it_IT
4. Initialize date with the value DateTime(2024, 1, 2)
5. Print the value of localizations.formatCompactDate(date)

### Expected results

The output should be 02/01/2024

### Actual results

Printed value is 2/1/2024

### Code sample

**pubspec.yaml**

```yaml

name: dateformat
description: A new Flutter project.
publish_to: "none"
version: 1.0.0+1
environment:
  sdk: '>=3.3.1 <4.0.0'
dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter

dev_dependencies:
  flutter_test:
    sdk: flutter
flutter:
  uses-material-design: true

```

**main.dart**

```dart

import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Date Format Test',
      localizationsDelegates: [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
        GlobalCupertinoLocalizations.delegate,
      ],
      supportedLocales: [
        const Locale('it', 'IT'),
        // ... other locales the app supports
      ],
      home: Scaffold(
        appBar: AppBar(title: Text('Date Format Test')),
        body: Builder(builder: (context) {
          final locale = Localizations.localeOf(context);
          final localizations = MaterialLocalizations.of(context);
          final date = DateTime(2024, 1, 2);
          return ListView(
            children: [
              Text('Current Locale: ${locale.toString()}'),
              Text('dateHelpText: ${localizations.dateHelpText}'),
              Text('Compact Date: ${localizations.formatCompactDate(date)}'),
              Text('Short Date: ${localizations.formatShortDate(date)}'),
              Text('Medium Date: ${localizations.formatMediumDate(date)}'),
              Text('Full Date: ${localizations.formatFullDate(date)}'),
            ],
          );
        }),
      ),
    );
  }
}

```





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### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
[√] Flutter (Channel stable, 3.19.3, on Microsoft Windows [Versione 10.0.22000.2538], locale it-IT)
    • Flutter version 3.19.3 on channel stable
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision ba39319843 (3 weeks ago), 2024-03-07 15:22:21 -0600
    • Engine revision 2e4ba9c6fb
    • Dart version 3.3.1
    • DevTools version 2.31.1

[√] Windows Version (Installed version of Windows is version 10 or higher)

[X] Android toolchain - develop for Android devices
    X Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.


[√] Chrome - develop for the web
    • Chrome 

[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.2.3)
    • Visual Studio Community 2022 version 17.2.32526.322
    • Windows 10 SDK version 10.0.19041.0

[!] Android Studio (not installed)
    • Android Studio not found; download from https://developer.android.com/studio/index.html
      (or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).

[√] IntelliJ IDEA (version 2023.3)
    • Flutter plugin version 78.4.2
    • Dart plugin version 233.14888

[√] Connected device (3 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Versione 10.0.22000.2538]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 123.0.6312.58
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 122.0.2365.92

[√] Network resources
    • All expected network resources are available.
```

</details>