Flutter can't convert Firestore Timestamp to DateTime

Question

Trying to convert Firestore Timestamp to DateTime in Flutter I'm getting always an error, tried all of the solutions, none worked ( last tried How to print Firestore timestamp as formatted date and time)

Here's my code below;

Code

factory UserModel.fromMap(Map<String, dynamic> map) {
    return UserModel(
      name: map['name'],
      email: map['email'],
      username: map['username'],
      registerDate:
          DateTime.fromMillisecondsSinceEpoch(map['registerDate'] * 1000),
      id: map['id'],
      imageUrl: map['imageUrl'],
      cvUrl: map['cvUrl'],
      phoneNumber: map['phoneNumber'],
      education: Education.fromMap(map['education']),
      location: Location.fromMap(map['location']),
      lookingForIntern: map['lookingForIntern'],
    );
  }

Error

'Timestamp' has no instance method '*'.
Receiver: Instance of 'Timestamp'

Converted DateTime to Timestamp, and changed

registerDate:
              DateTime.fromMillisecondsSinceEpoch(map['registerDate'] * 1000),

to

registerDate:map['registerDate']

now getting error below;

Converting object to an encodable object failed: Instance of 'Timestamp'

but print(map['registerDate']) prints Timestamp(seconds=1632412800, nanoseconds=0)

This bug seems out there for a long time, The solution would be having the TimeStamp in model instead of the DateTime. — EngineSense, Sep 24 '21 at 06:51
@EngineSense Can you please check the [following thread](https://stackoverflow.com/questions/50632217/dart-flutter-converting-timestamp) if it answers your question? — Rajeev Tirumalasetty, Sep 24 '21 at 15:26
Does this answer your question? [How do I convert a Firestore Timestamp to a Dart DateTime](https://stackoverflow.com/questions/57153562/how-do-i-convert-a-firestore-timestamp-to-a-dart-datetime) — Rajeev Tirumalasetty, Oct 13 '21 at 11:48
I switched my DateTime variable to 'dynamic' then converted it to DateTime in my UI using https://pub.dev/packages/date_format this package. But no, you can't convert Timestamp to DateTime directly, really annoying. — Emir Kutlugün, Oct 20 '21 at 10:57

score 0 · Answer 1 · edited Sep 24 '21 at 07:29

0

Try this package to handle the problem-

https://pub.dev/packages/date_format

import 'package:date_format/date_format.dart';


     DateTime datetime = stamp.toDate();
        var time = formatDate(datetime, [hh, ':', nn, ' ', am]);

edited Sep 24 '21 at 07:29

Dharman

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answered Sep 24 '21 at 07:23

Vishal_VE

1,852
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1

unfortunately not related with problem – Emir Kutlugün Sep 24 '21 at 07:46

Boommeister · Answer 2 · 2022-12-31T10:39:20.120

I have this firebase function that is returning a TimeStamp (admin.firestore.Timestamp) in the field dueDateLatestRental:

 return {
                    data: { 'rental': null, 'hash': null, 'dueDateLatestRental': dueDateLatestRental },
                    status: 403,
                    message: itemStatus

In my flutter code I'm parsing the timestamp like this:

try {
          dynamic dueDateLatestRental = result.data['data']['dueDateLatestRental'];
          final data = Map<String, dynamic>.from(dueDateLatestRental) as Map<String, dynamic>;
          DateTime dueDateLatestRentalString = DateTime.fromMillisecondsSinceEpoch(data['_seconds'] * 1000).toLocal();
          String formattedDueDate = formatDate(dueDateLatestRentalString, [dd, '.', mm, '.', yyyy, ' ', HH, ':', nn]);
          logger.i('addRental result: $formattedDueDate');
            QuickAlert.show(
              context: context,
              type: QuickAlertType.error,
              title: 'Nicht verfügbar',
              text:
              'Das Teil ist bis zum $formattedDueDate ausgeliehen.',
              confirmBtnText: 'Okay',
              onConfirmBtnTap: () async {
                log("Box was not opened");
                Navigator.pop(context);
              },);
            return null;
        } catch (e) {
          logger.e("Error: could not parse the dueDateLatestRental");
          QuickAlert.show(
            context: context,
            type: QuickAlertType.error,
            title: 'Nicht verfügbar',
            text:
            'Das Teil ist bereits ausgeliehen. Bitte warte ein paar Tage.',
            confirmBtnText: 'Okay',
            onConfirmBtnTap: () async {
              log("Box was not opened");
              Navigator.pop(context);
            },
          );
          return null;
        }

I think it's safer to wrap this in a try/catch, because there are many ways how this could brake over time (e.g. me changing something in the database structure)

This is the resulting Alert Dialog:

krishnaacharyaa · Answer 3 · 2022-12-31T13:51:09.610

There are different ways this can be achieved based on different scenario, see which of the following code fits your scenario.

```
map['registerDate'].toDate()
```

(map["registerDate"] as Timestamp).toDate()

DateTime.fromMillisecondsSinceEpoch(map['registerDate'].millisecondsSinceEpoch);

Timestamp.fromMillisecondsSinceEpoch(map['registerDate'].millisecondsSinceEpoch).toDate();

Add the following function in your dart file.

String formatTimestamp(Timestamp timestamp) {
  var format = new DateFormat('yyyy-MM-dd'); // <- use skeleton here
  return format.format(timestamp.toDate());
}

call it as formatTimestamp(map['registerDate'])

bakboem · Answer 4 · 2022-12-31T14:56:21.980

datetime is to store the current time zone of the server. The timestamp type is to convert the current time of the server to UTC (world time) for storage
you can set Firestore document arguments type to int

  @JsonKey(fromJson: timeFromJson, toJson: timeToJson)
  DateTime fileCreateTime;

  static DateTime timeFromJson(int timeMicroseconds) =>
      Timestamp.fromMicrosecondsSinceEpoch(timeMicroseconds).toDate().toLocal();
  static int timeToJson(DateTime date) =>
      Timestamp.fromMillisecondsSinceEpoch(date.toUtc().millisecondsSinceEpoch)
          .microsecondsSinceEpoch;

Flutter can't convert Firestore Timestamp to DateTime

4 Answers4