Flutter How to get network DateTime.Now()?

Question

Actually in flutter DateTime.now() is returns device date and time. Users sometimes change their internal clock and using DateTime.now() can give w

Answer 1

It's not possible without any api call.

There is a plugin that allows you to get precise time from Network Time Protocol (NTP). It implements the whole NTP protocol in dart.

This is useful for time-based events since DateTime.now() returns the time of the device. Users sometimes change their internal clock and using DateTime.now() can give the wrong result. You can just get clock offset [NTP.getNtpTime] and apply it manually to DateTime.now() object when needed (just add offset as milliseconds duration), or you can get already formatted [DateTime] object from [NTP.now].

Add this to your package's pubspec.yaml file:

dependencies:
  ntp: ^1.0.7

Then add the code like this:

import 'package:ntp/ntp.dart';

Future main() async {
  DateTime _myTime;
  DateTime _ntpTime;

  /// Or you could get NTP current (It will call DateTime.now() and add NTP offset to it)
  _myTime = await NTP.now();

  /// Or get NTP offset (in milliseconds) and add it yourself
  final int offset = await NTP.getNtpOffset(localTime: DateTime.now());
  _ntpTime = _myTime.add(Duration(milliseconds: offset));

  print('My time: $_myTime');
  print('NTP time: $_ntpTime');
  print('Difference: ${_myTime.difference(_ntpTime).inMilliseconds}ms');
}