在Flutter中解析JSON日期

dependencies:
  flutter:
    sdk: flutter
  json_annotation: ^4.0.1
  json_serializable: ^4.1.4

dev_dependencies:
  flutter_test:
    sdk: flutter
  build_runner: ^2.1.5

import 'package:json_annotation/json_annotation.dart';

part 'your_model.g.dart';

@JsonSerializable()
class YourModel {
  final String name;
  @JsonKey(fromJson: _dateTimeFromJson, toJson: _dateTimeToJson)
  final DateTime date;

  YourModel({required this.name, required this.date});

  factory YourModel.fromJson(Map<String, dynamic> json) =>
      _$YourModelFromJson(json);
  Map<String, dynamic> toJson() => _$YourModelToJson(this);

  static DateTime _dateTimeFromJson(int timestamp) =>
      DateTime.fromMillisecondsSinceEpoch(timestamp);
  static int _dateTimeToJson(DateTime dateTime) =>
      dateTime.millisecondsSinceEpoch;
}

flutter pub run build_runner build

import 'dart:convert';

void main() {
  String jsonStr = '{"name": "John", "date": 1638470400000}';
  Map<String, dynamic> json = jsonDecode(jsonStr);
  YourModel model = YourModel.fromJson(json);

  print(model.name); // 输出：John
  print(model.date); // 输出：2021-12-03 00:00:00.000
}