Formatting of the date to the local "de_DE" fails - flutter

Question

I've gat a problem to format the Date of a DayView in the format of Germany. It ist always shown in yyyy-MM-dd, but the format I want tu use is dd.MM.yyyy. I tried a few things, but nothing works I want to.
At first I format the date like this
String datumDesTages = DateFormat.yMd('de_DE').format(DateTime.now());
this works fine, so date is shown as dd.MM.yyyy.
But for the DayTime I need a DateTime, so I try to parse it like shown below:
DateTime datumDesTagesDateTime =
Intl.withLocale('de', () => DateFormat().parse(datumDesTages));
but then I get the error
The following FormatException was thrown building EventSet(dirty, state: _EventSetState#95b2d):
Trying to read . from 12.2.2023 at position 4
the entire code is:
lass _EventSetState extends State<EventSet> {
#override
Widget build(BuildContext context) {
String datumDesTages = DateFormat.yMd('de_DE').format(DateTime.now());
//String datumDesTagesString = datumDesTages.format(DateTime.now());
DateTime datumDesTagesDateTime =
Intl.withLocale('de', () => DateFormat().parse(datumDesTages));
//DateFormat('d.M.y').parse(datumDesTagesString));
return Scaffold(
appBar: AppBar(
title: Text('Termin setzen'),
),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
children: [
Expanded(
child: Container(
child: DayView(
date: datumDesTagesDateTime,
style: DayViewStyle.fromDate(
date: datumDesTagesDateTime,
headerSize: 20,
),
),
),
),
// EventDetailScreen(),
],
),
),
floatingActionButton: FloatingActionButton(
child: Icon(
Icons.add,
color: Colors.blue,
),
backgroundColor: Colors.red[50],
onPressed: () {
Navigator.of(context).pushNamed(EventDetailScreen.routeName);
},
),
);
}
}
I don't know how to solve this problem. Thank you for your help.
kind regards
Patrick

Answer 1

You need to load the appropriate data for your language first.
Take a look at the readme from https://pub.dev/packages/intl
Note that before doing any DateTime formatting for a particular locale, you must load the appropriate data by calling.
import 'package:intl/date_symbol_data_local.dart';
...
initializeDateFormatting('de_DE', null).then(formatDates);