How to load all dart DateFormat locale in flutter?

In Flutter app, intl package load only [15 languages](

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). However Dart [DateFormat](

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) support many more. I do not need translation, but need correct `DateFormat`. How to load all `DateFormat` locale?

In your highest StatefulWidget add these imports

import 'package:intl/intl.dart';
import 'package:intl/date_symbol_data_local.dart';

in its State, override initState and add

@override
void initState() {
super.initState();
initializeDateFormatting();
}
For example

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:intl/date_symbol_data_local.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Intl Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Intl Demo Home Page'),
);
}
}

class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);

final String title;

@override
_MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
DateFormat dateFormat;
DateFormat timeFormat;

@override
void initState() {
super.initState();
initializeDateFormatting();
dateFormat = new DateFormat.yMMMMd('cs');
timeFormat = new DateFormat.Hms('cs');
}

void _refresh() {
setState(() {});
}

@override
Widget build(BuildContext context) {
var dateTime = new DateTime.now();
return new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
),
body: new Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Text(dateFormat.format(dateTime)),
new Text(timeFormat.format(dateTime)),
],
),
),
floatingActionButton: new FloatingActionButton(
onPressed: _refresh,
tooltip: 'Refresh',
child: new Icon(Icons.refresh),
),
);
}
}

Dart mostly uses the [ISO 631][1] 2 letter codes, with country variants if applicable. For example: `ja, en_US, en_GB, zh_HK, zh_CN`. Occasionally it uses a 3 letter code. To find the full list just search for `DateSymbols` in the file [date_symbol_data_local.dart][2]

[![The cs language displays this][3]][3]


[1]:

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[2]:

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[3]:

Quoting [@kapace](

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) comment:

> You should use language tag in order to be sure that you consider locale's country code. Like in Canada where language is same `en` as `en-US`, but they format dates slightly different using `en-CA` locale.

For example:

```dart
var tag = Localizations.maybeLocaleOf(context)?.toLanguageTag();

var date1 = DateFormat.yMMMd(tag).format(DateTime.now()); // Dec 31, 2000
var date2 = DateFormat('MM/dd, hh:mm a', tag).format(DateTime.now()); // 12/31, 11:00 PM
```

I solved it setting the Intl.sytemLocale before using any DateFormat:

Intl.systemLocale = await findSystemLocale();

I didn't had to call `initializeDateFormatting()` and I'm using `intl: ^0.17.0`.

The list of all available locales in Flutter can be take from top-level property [availableLocalesForDateFormatting][1] of `intl` package.
```dart
final availableLocalesForDateFormatting = const [
"en_ISO",
"af",
"am",
"ar",
"ar_DZ",
"ar_EG",
"az",
"be",
"bg",
"bn",
"br",
"bs",
"ca",
"chr",
"cs",
"cy",
"da",
"de",
"de_AT",
"de_CH",
"el",
"en",
"en_AU",
"en_CA",
"en_GB",
"en_IE",
"en_IN",
"en_MY",
"en_SG",
"en_US",
"en_ZA",
"es",
"es_419",
"es_ES",
"es_MX",
"es_US",
"et",
"eu",
"fa",
"fi",
"fil",
"fr",
"fr_CA",
"fr_CH",
"ga",
"gl",
"gsw",
"gu",
"haw",
"he",
"hi",
"hr",
"hu",
"hy",
"id",
"in",
"is",
"it",
"it_CH",
"iw",
"ja",
"ka",
"kk",
"km",
"kn",
"ko",
"ky",
"ln",
"lo",
"lt",
"lv",
"mk",
"ml",
"mn",
"mr",
"ms",
"mt",
"my",
"nb",
"ne",
"nl",
"no",
"no_NO",
"or",
"pa",
"pl",
"ps",
"pt",
"pt_BR",
"pt_PT",
"ro",
"ru",
"si",
"sk",
"sl",
"sq",
"sr",
"sr_Latn",
"sv",
"sw",
"ta",
"te",
"th",
"tl",
"tr",
"uk",
"ur",
"uz",
"vi",
"zh",
"zh_CN",
"zh_HK",
"zh_TW",
"zu"
];
```


[1]:

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just add the language code like this (in my case 'ar' for Arabic)

DateFormat('MMMM', 'ar') .format(DateTime.now());