Flutter app error - type 'Timestamp' is not a subtype of type 'DateTime'

Question

I\'m fetching data cloud firestore & trying to show in my app by using the following piece of code.

new Text(timeago.format(document.data[\'tripDoc\'][\'         


        

Answer 1

Try document.data["data"].microsecondsSinceEpoch

This is working for me:-

User.fromDocument(DocumentSnapshot document){
dataNasc = DateTime.fromMicrosecondsSinceEpoch(document.data["data"].microsecondsSinceEpoch);
}

Answer 2

DateTime.fromMillisecondsSinceEpoch(timeStamp);
DateTime.fromMicrosecondsSinceEpoch(timeStamp);

Answer 3

If you use JsonSerializable, Use JsonConverter

class TimestampConverter implements JsonConverter<DateTime, Timestamp> {
  const TimestampConverter();

  @override
  DateTime fromJson(Timestamp timestamp) {
    return timestamp.toDate();
  }

  @override
  Timestamp toJson(DateTime date) => Timestamp.fromDate(date);
}

@JsonSerializable()
class User{
  final String id;
  @TimestampConverter()
  final DateTime timeCreated;

  User([this.id, this.timeCreated]);

  factory User.fromSnapshot(DocumentSnapshot documentSnapshot) =>
      _$UserFromJson(
          documentSnapshot.data..["_id"] = documentSnapshot.documentID);

  Map<String, dynamic> toJson() => _$UserToJson(this)..remove("_id");
}

Answer 4

The Cloud Firebase timestamp field type has the structure:

Timestamp (Timestamp(seconds=1561186800, nanoseconds=0))
hashCode:423768083
microsecondsSinceEpoch:1561186800000000
millisecondsSinceEpoch:1561186800000
nanoseconds:0
runtimeType:Type (Timestamp)
seconds:1561186800
_seconds:1561186800
_nanoseconds:0

So you can use either micro- or milliseconds:

DateTime.fromMillisecondsSinceEpoch(data['tripDoc']['docCreatedOn'].millisecondsSinceEpoch)

or

DateTime.fromMicrosecondsSinceEpoch(data['tripDoc']['docCreatedOn'].microsecondsSinceEpoch)

Answer 5

You can try this..

timeago.format(DateTime.tryParse(timestamp))

like in yours it will be

  timeago.format(DateTime.tryParse(document.data['tripDoc']['docCreatedOn']))

Answer 6

For some funny reason, I can't use toDate() on Android. Have to use it for iOS. So I'm forced to use a platform check like this:

Theme.of(context).platform == TargetPlatform.iOS
  ? DateFormat('dd MMM kk:mm').format(document['timestamp'].toDate())
  : DateFormat('dd MMM kk:mm').format(document['timestamp'])