convert a json to table calendar events

table-calendar-json.dart

import 'dart:convert';

void main() {
  var jsonSource = """
  {
   "Events": [
        {
            "id": 1,
            "event_name": "Cake tasting",
            "event_photo": "https://dispensaries.s3.amazonaws.com/event_photo/Southern_Cali_Kush_3.jpg",
            "vendor_name": {
                "id": 1,
                "vendor": "Tastey Cakes"
            },
            "refund_available": false,
            "website": "www.foodcakes.com",
            "share_count": 0,
            "check_in_count": 0,
            "street_address": "123 Fake Street",
            "city": "Brooklynn",
            "state": "NY",
            "zipcode": "12312",
            "event_tagline": "Taste my cakes",
            "details": "Cake tasting",
            "start_date": "2020-11-03",
            "start_time": "23:33:00",
            "end_time": "23:33:00",
            "attendees": []
        }
    ]
    }
  """;
  print(convertJsonToDateMap(jsonSource));
}

Map<DateTime, List> convertJsonToDateMap(String jsonSource) {
  var json = jsonDecode(jsonSource);
  var jsonEvents = json['Events'];
  Map<DateTime, List<String>> events = {};
  for(var event in jsonEvents){
    var date = parseDate(event['start_date']);
    events.putIfAbsent(date, () => <String>[]);
    events[date].add(event['event_name']);
  }
  return events;
}

DateTime parseDate(String date) {
  var parts = date.split('-').map(int.tryParse).toList();
  return DateTime(parts[0], parts[1], parts[2]);
}