firebase - 在Flutter Cloud Firestore中， 'DateTime'类型不是 'String'类型的子类型

Question

我正在尝试获取DateTime.now()并使用Cloud FireStore进行写入/读取。但是得到了错误

这是我的代码

在用户界面中

Text( 
DateFormat('dd/MM/yyyy kk:mm')
.format(DateTime
.fromMillisecondsSinceEpoch(int.parse(document[index].data['timeCreated']))),
style: timeStyle,
),

将数据写入Firestore

Firestore.instance.runTransaction((transaction) async {
      await transaction.set(
        docRef,
        {'timeCreated': DateTime.now().millisecondsSinceEpoch.toString()},
      );
    });

并得到这个错误

I/flutter ( 3378): Another exception was thrown: type 'DateTime' is not a subtype of type 'String'

Answer 1

转换为字符串:

int time = DateTime.now().millisecondsSinceEpoch;
String t = "$time";