Flutter Timezone (as ZoneId)

Question

I am relative new to Flutter. While I was experimenting, I came across with an issue. My REST Api takes a timezone parameter (Zone ID format such as Europe/London).

I saw both https://pub.dartlang.org/packages/flutter_native_timezone and https://pub.dartlang.org/packages/timezone, but neither of those serve my needs.

My goal is, when the user connect to the internet (without giving any location access to the app, if it is possible), get the timezone in ZoneId format and feed my back end in order to make the necessary date and time adjustments. Something similar to this

>>> var timezone = jstz.determine();
>>> timezone.name(); 
"Europe/London"

Presented in https://bitbucket.org/pellepim/jstimezonedetect

Any insights will be really helpful.

Thanks in advance

Answer 1

I've been also looking for this and here's what I found: https://pub.dev/packages/flutter_native_timezone

It a bit hacky under the hood, but it seems to work properly on both iOS and Android. Hope this will help someone in need.

Usage:

final String currentTimeZone = await FlutterNativeTimezone.getLocalTimezone();
print(currentTimeZone); // Europe/Moscow

Answer 2

Came up with a simple solution:

//server time(UTC)
String date_to_parse = "2019-06-23 12:59:43.444896+00:00";
DateTime server_datetime = DateTime.parse(date_to_parse);

//get current system local time
DateTime local_datetime = DateTime.now();

//get time diff
var timezoneOffset = local_datetime.timeZoneOffset;
var time_diff = new Duration(hours: timezoneOffset.inHours, minutes: timezoneOffset.inMinutes % 60);

//adjust the time diff
var new_local_time = server_datetime.add(time_diff);

Answer 3

You can simply add .toLocal() to your DateTime object.

myDate = otherDate.toLocal();

myDate = DateTime.parse(json['server_date']).toLocal();