How to Localize DatePicker in Flutter?

1. Add flutter_localizations plugin in pubspec.yaml and run pub get.

           dependencies:
           flutter:
                 sdk: flutter
              flutter_localizations: 
                 sdk: flutter     

2. Import the plugin in dart file.

import 'package:flutter_localizations/flutter_localizations.dart'; 

3. Inside MaterialApp, add the following:

  return const MaterialApp(
  localizationsDelegates: [
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate,
    GlobalCupertinoLocalizations.delegate,
  ],
  supportedLocales: [
    Locale('en'),
    Locale('tr'),  
  ],
  home: MyHomePage(),
);

4. then add this to your datetime picker

locale: const Locale("tr"),

Example Code

showDatePicker(
            context: context,
            locale: const Locale("tr"),
            initialDate: DateTime.now(),
            firstDate: DateTime(2018),
            lastDate: DateTime(2030),
            builder: (BuildContext context, Widget? child) {
              return Theme(
                data: ThemeData.dark(),
                child: child!,
              );
            });