Question 74616 in Flutter Question posted in
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Convert DateTime as TimeStamp using jsonSerializable in Flutter

While we serialize or de-serialize the model using jsonSerializable in Flutter it converts the DateTime as String

class Task {
 final DateTime dateTime;
 final String taskName;

 Task({
  required this.dateTime,
  required this.taskName
 }):
}

Instead of converting as string it should convert as TimeStamp

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3

Answers


  1. Chosen as BEST ANSWER
    0
    1. We can annotate the field with @TimeStampConverter
    class Task {
 @TimeStampConvertor
 final DateTime dateTime;
 final String taskName;

 Task({
  required this.dateTime,
  required this.taskName
 }):
}
    1. Create a class for TimeStampConverter
    class TimestampConverter implements JsonConverter<DateTime, Timestamp> {
  const TimestampConverter();

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

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

  2. 0

    Try with this:

    import 'package:cloud_firestore/cloud_firestore.dart';

// For Converting Firebase Timestamp to DateTime
 
 //From Firebase field to Dart Timestamp
 Timestamp _timestamp = doc['dateTime'];
 
 //From Timestamp to Dart DateTime
 DateTime date = _timestamp.toDate();

 //From Dart DateTime to Timestamp
  Timestamp _timestamp =
          Timestamp.fromDate(DateTime.now());
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  3. 0

    Use @JsonKey. This is a sample from json_serializable :

     @JsonSerializable()
 class Sample3 {
   Sample3(this.value);

   factory Sample3.fromJson(Map<String, dynamic> json) =>
       _$Sample3FromJson(json);

   @JsonKey(
     toJson: _toJson,
     fromJson: _fromJson,
   )
   final DateTime value;

   Map<String, dynamic> toJson() => _$Sample3ToJson(this);

   static int _toJson(DateTime value) => value.millisecondsSinceEpoch;
   static DateTime _fromJson(int value) =>
       DateTime.fromMillisecondsSinceEpoch(value);
 }
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