flutter - 如何获取网络 DateTime.Now()？

Question

其实在 flutter DateTime.now()是返回设备日期和时间。用户有时会更改其内部时钟并使用 DateTime.now()可以给出错误的结果。

我怎样才能得到 网络/服务器当前日期时间 在 flutter 中？

有没有可能得到网络/服务器当前日期时间 不使用任何软件包？

提前致谢!

Answer 1

没有任何 API 是不可能的 .您可以使用 ntp 插入:

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].

将此添加到包的 pubspec.yaml 文件中:

dependencies:
  ntp: ^1.0.7

然后像这样添加代码:

import 'package:ntp/ntp.dart';

Future<void> 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');
}