How to convert DateTime object to json

问题:

How to convert DateTime object to json? It throws Converting object to an encodable object failed., so is this a bug or it's just dart haven't yet support it? If you guys know some workaround please let me know.

回答1:

Rather than using a wrapper, you can also create your own custom encoder passing the toEncodable argument.

import 'dart:convert' show JSON;

void main() {
  var dt = new DateTime.now();
  var str = JSON.encode(dt, toEncodable: myEncode);
  print(str);
}

dynamic myEncode(dynamic item) {
  if(item is DateTime) {
    return item.toIso8601String();
  }
  return item;
}

回答2:

first: JSON does not support date/time encoding.. this is usually done by convention depending on the other party - usually a string representation (e.g. ISO8601 but Microsoft's ASP.NET uses a custom format).

second: How to convert an object containing DateTime fields to JSON in Dart?
(In short: Runtime does not serialise DateTime. You'll need to create a wrapper with custom serialisation logic.)