Support custom DateTime formats

[westy92]

I'd like to (un)serialize a DateTime in a custom format, such as:

 new DateFormat('M/d/yyyy');

Currently I get a runtime exception:

I/flutter (20794): FormatException: Invalid date format
I/flutter (20794): 04/10/2015

[westy92]

Is it possible using a method like this?

[thosakwe]

I think that the TypeHelper functionality could potentially solve this for you. I'm not 100% sure how to use it, but it seems like once it's documented it'll be a possibility.

[kevmoo]

This will be easily solved with #146

[kevmoo]

See here for how you can get this done w/out creating a custom TypeHelper.

https://github.com/dart-lang/json_serializable/blob/bb96ddc0c241d07879d06f2209a210d2e73df31b/json_serializable/test/test_files/json_test_example.dart#L125-L151

Will be published soon!

[westy92]

Thanks! I got this to work. Leaving a DateTime with a custom format example for others:

@JsonSerializable()
class Test extends Object with _$TestSerializerMixin {

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

  Test({
    this.date,
  });

  factory Test.fromJson(Map<String, dynamic> json) => _$TestFromJson(json);
}

final _dateFormatter = new DateFormat('M/d/yyyy');
DateTime _fromJson(String date) => _dateFormatter.parse(date);
String _toJson(DateTime date) => _dateFormatter.format(date);

[kevmoo]

So glad!

…

On Thu, May 10, 2018, 21:57 Seth Westphal ***@***.***> wrote: Thanks! I got this to work. Leaving a DateTime with a custom format example for others: @JsonSerializable()class Test extends Object with _$TestSerializerMixin { @jsonkey(fromJson: _fromJson, toJson: _toJson) final DateTime date; Test({ this.date, }); factory Test.fromJson(Map<String, dynamic> json) => _$TestFromJson(json); } final _dateFormatter = new DateFormat('M/d/yyyy');DateTime _fromJson(String date) => _dateFormatter.parse(date);String _toJson(DateTime date) => _dateFormatter.format(date); — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub <#133 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AABCipPS02eJgTawgajudDj26k8R5y-Yks5txRo9gaJpZM4TNoUJ> .

[tulioccalazans]

Ah, its gotta be a static member.

static final _dateFormatter = DateFormat('M/d/yyyy');
static DateTime _fromJson(String date) => _dateFormatter.parse(date);
static String _toJson(DateTime date) => _dateFormatter.format(date);

[Sunbreak]

@JsonSerializable()
class TestItem {
  @JsonKey(fromJson: DateTimeHelper.toIso8601Json, toJson: DateTimeHelper.toIso8601Json)
  String createTime;

  TestItem(this.createTime);

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

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

extension DateTimeHelper on DateTime {
  static DateTime fromIso8601Json(String json) => DateTime.parse(json);

  static String toIso8601Json(DateTime date) => date.toIso8601String();
}