Google Calendar API returning generic Bad Request - flutter

Question

I'm currently struggling with figuring out what's wrong with a Event insert I'm trying to accomplish in Flutter using Google Calendar V3 API. Initially I thought it's a matter of RFC3339 vs ISO8601 date formats, but I'm grasping at straws.
Unhandled Exception: DetailedApiRequestError(status: 400, message: Bad Request) is what I'm getting from:
import 'package:googleapis/calendar/v3.dart';
import 'package:googleapis_auth/auth.dart';
import 'package:googleapis_auth/auth_io.dart';
...
var calendar = await getCalendar();
var ac = await getOrCreateCredentials();
var client = await getClient(ac);
var calendarId = await storage.read(key: "calendar_id");
var capi = CalendarApi(client);
EventCreator ec = new EventCreator();
ec.displayName = "Display Name";
EventDateTime edt = new EventDateTime();
int hour = int.parse(ds.hour.split(":")[0]);
int min = int.parse(ds.hour.split(":")[1]);
DateTime x = ds.data.add(Duration(hours: hour, minutes: min));
edt.dateTime = x;
edt.timeZone = x.timeZoneName;
EventDateTime edtEnd = new EventDateTime();
DateTime y = x.add(Duration(hours: 1));
edtEnd.dateTime = y;
edtEnd.timeZone = y.timeZoneName;
Event e = new Event();
e.created = DateTime.now();
e.creator = ec;
e.description = d.var + " \n" + d.var;
e.summary = "Summary";
e.etag = d.var;
e.location = d.var;
e.start = edt;
e.end = edtEnd;
try {
capi.events.insert(e, calendarId);
The full JSON response contains nothing else except global domain, badrequest and HTTP 400 code.
I also tried .toUtc() on the DateTime objects to make them RFC3339 compliant, but still the same error presents.
Later Edit
The issue is indeed related to the time, the Dart DateTime class does not format the time in a way Google likes (2021-04-12T08:30:00+03:00 which I've deduced from other languages' API implementations, and the source code of the package which does a .toString() of the DateTime basically).
The way around this is to create the EventDateTime from a JSON object, and to use a hacky Dart extension. I apologize for the naming but it's annoying.
extension FuckyDateTime on DateTime {
Map<dynamic, dynamic> fuckyDateTime() {
Map<dynamic, dynamic> x = new Map();
String formatted = this.year.toString() +
'-' +
(this.month.toString().length == 1
? '0' + this.month.toString()
: this.month.toString()) +
'-' +
(this.day.toString().length == 1
? '0' + this.day.toString()
: this.day.toString()) +
'T' +
(this.hour.toString().length == 1
? '0' + this.hour.toString()
: this.hour.toString()) +
':' +
(this.minute.toString().length == 1
? '0' + this.minute.toString()
: this.minute.toString()) +
':' +
(this.second.toString().length == 1
? '0' + this.second.toString()
: this.second.toString()) +
'+' +
'03:00';
x.putIfAbsent('dateTime', () => formatted);
x.putIfAbsent('timeZone', () => 'Europe/Bucharest');
return x;
}
}
and EventDateTime edt = new EventDateTime.fromJson(x.fuckyDateTime()); where x is a DateTime object.

Answer 1

The issue is indeed related to the time, the Dart DateTime class does not format the time in a way Google likes (2021-04-12T08:30:00+03:00 which I've deduced from other languages' API implementations, and the source code of the package which does a .toString() of the DateTime basically). Fair mention that Dart DateTime does provide a String of ISO8601, Google wants an RFC3339 compliant date.
The way around this is to create the EventDateTime from a JSON object, and to use a hacky Dart extension. I apologize for the naming but it's annoying.
extension FuckyDateTime on DateTime {
Map<dynamic, dynamic> fuckyDateTime() {
Map<dynamic, dynamic> x = new Map();
String formatted = this.year.toString() +
'-' +
(this.month.toString().length == 1
? '0' + this.month.toString()
: this.month.toString()) +
'-' +
(this.day.toString().length == 1
? '0' + this.day.toString()
: this.day.toString()) +
'T' +
(this.hour.toString().length == 1
? '0' + this.hour.toString()
: this.hour.toString()) +
':' +
(this.minute.toString().length == 1
? '0' + this.minute.toString()
: this.minute.toString()) +
':' +
(this.second.toString().length == 1
? '0' + this.second.toString()
: this.second.toString()) +
'+' +
'03:00';
x.putIfAbsent('dateTime', () => formatted);
x.putIfAbsent('timeZone', () => 'Europe/Bucharest');
return x;
}
}
and EventDateTime edt = new EventDateTime.fromJson(x.fuckyDateTime()); where x is a DateTime object.