Flutter用Golang RFC3339中的DateTime解析json：FormatException：无效的日期格式

When trying to read json files generated with golangs json package in Dart / Flutter I noticed that parsing dates produce an error:

FormatException: Invalid date format

An example is the following json generated on the Go server:

{
    ...
    "dateCreated": "2018-09-29T19:51:57.4139787-07:00",
    ...
}

I am using the code generation approach for json (de-)serialization to avoid writing all the boiler plate code. The json_serializable package is a standard package available for this purpose. So my code looks like the following:

@JsonSerializable()
class MyObj {

  DateTime dateCreated;

  MyObj( this.dateCreated);

  factory MyObj.fromJson(Map<String, dynamic> json) => _$MyObjFromJson(json);  
  Map<String, dynamic> toJson() => _$MyObjToJson(this); 
}