how to decode Json to DateTime format in flutter? - json

Question

im trying to store my List data in a disk storage using shared preferences, however idk how to convert the json back to DateTime format when trying to fetch data again from memory when i rebuild/restart the app.
here's my code:
String id;
String title;
double amount;
DateTime date;
Transaction({
#required this.id,
#required this.title,
#required this.amount,
#required this.date,
});
Transaction.fromMap(Map map)
: this.id = map['id'],
this.title = map['title'],
this.date = map['date'],
this.amount = map['amount'];
Map toMap() {
return {
'id': this.id,
'title': this.title,
'date': this.date.toIso8601String(),
'amount': this.amount,
};
}
}
heres where im using sharedPreferences
#override
void initState() {
initSharedPreferences();
super.initState();
}
initSharedPreferences() async {
sharedPreferences = await SharedPreferences.getInstance();
loadData();
}
void saveData() {
setState(() {
List<String> spList =
transactions.map((item) => json.encode(item.toMap())).toList();
var list = sharedPreferences.setStringList('list', spList);
print(list);
});
}
void loadData() {
List<String> spList = sharedPreferences.getStringList('list');
transactions =
spList.map((item) => Transaction.fromMap(json.decode(item))).toList();
setState(() {});
print(transactions);
}

Answer 1

In Transaction.fromMap constructor
replace
this.date = map['date'],
with
this.date = DateTime.parse(map['date']),