createdAt property Null safety

DateTime? createdAt

@JsonKey(name: 'created_at', fromJson: dateTimeFromJson, toJson: dateTimeToJson), read / write

카드 데이터가 생성된 날짜입니다.

Implementation

@JsonKey(name: 'created_at', fromJson: dateTimeFromJson, toJson: dateTimeToJson)
DateTime? createdAt;