日期时间时区反序列化 [英] Datetime timezone deserialization

问题描述

我已经为我的应用开发了Rest API.它以以下格式 2018-09-07T17:29:12 + 02:00 将日期发送到应用程序，我猜+2:00表示我的时区是一个对象的一部分.

I've developed a Rest API for my app. It sends to the app dates in the following format 2018-09-07T17:29:12+02:00, where I guess +2:00 represents my timezone as part of one object.

在Flutter应用中，反序列化接收到的对象后，它会将实际接收到的DateTime对象减去两个小时.

In my Flutter app, once I deserialize the received object, it substracts two hours to the actual received DateTime object.

我要反序列化的类定义如下:

The class I'm trying to deserialize is defined as follows:

import 'package:json_annotation/json_annotation.dart';

part 'evento.g.dart';

@JsonSerializable(nullable: false)
class Evento {
  final int id;
    final String nombre;
    final String discoteca;
    final int precio_desde;
    final int edad_minima;
    final DateTime fecha_inicio;
    final DateTime fecha_fin;
    final DateTime fecha_fin_acceso;
    final String cartel;
  final bool incluyeCopa;
    Evento(this.id, this.nombre, this.discoteca, this.precio_desde, this.edad_minima, this.fecha_inicio, this.fecha_fin, this.fecha_fin_acceso, this.cartel, this.incluyeCopa, this.num_tipos);
  factory Evento.fromJson(Map<String, dynamic> json) => _$EventoFromJson(json);
  Map<String, dynamic> toJson() => _$EventoToJson(this);
} 

推荐答案

DateTime 只能表示本地时间和UTC时间.

DateTime can only represent local time and UTC time.

它支持解析时区偏移，但将其标准化为UTC

It supports timezone offset for parsing, but normalizes it to UTC

print(DateTime.parse('2018-09-07T17:29:12+02:00').isUtc);

打印 true .

然后只能使用 toLocal()或 toUtc()

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