get local time for different location in flutter - flutter

Question

is there a simple way to get time for a different location than the current location in flutter ?
for example the current location is set to Japan,Tokyo and I want the time in Turkey, Istanbul from the system itself not from API

Answer 1

You can copy paste run full code below
You can use package https://pub.dev/packages/timezone
Step 1: download 2019c.tzf from https://github.com/srawlins/timezone/tree/master/lib/data
Step 2: put 2019c.tzf to assets directory
Step 3: Edit pubspec.yaml
working demo
code snippet
void main() async {
WidgetsFlutterBinding.ensureInitialized();
var byteData = await rootBundle.load('assets/2019c.tzf');
initializeDatabase(byteData.buffer.asUint8List());
runApp(MyApp());
}
...
final detroit = getLocation('America/Detroit');
final us = getLocation('US/Pacific');
final tokyo = getLocation('Asia/Tokyo');
nowDetroit = new TZDateTime.now(detroit);
nowUs = new TZDateTime.now(us);
nowTokyo = TZDateTime.now(tokyo);
full code
import 'package:flutter/material.dart';
import 'package:flutter/services.dart' show rootBundle;
import 'package:timezone/timezone.dart';
import 'package:timezone/standalone.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
var byteData = await rootBundle.load('assets/2019c.tzf');
initializeDatabase(byteData.buffer.asUint8List());
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
TZDateTime nowDetroit;
TZDateTime nowUs;
TZDateTime nowTokyo;
void _incrementCounter() {
final detroit = getLocation('America/Detroit');
final us = getLocation('US/Pacific');
final tokyo = getLocation('Asia/Tokyo');
nowDetroit = new TZDateTime.now(detroit);
nowUs = new TZDateTime.now(us);
nowTokyo = TZDateTime.now(tokyo);
_counter++;
setState(() {
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(' America/Detroit ${nowDetroit.toString()}'),
Text(' US/Pacific ${nowUs.toString()}'),
Text(' Asia/Tokyo ${nowTokyo.toString()}'),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}