Datetime 将时间戳转换为无时间日期的颤振镖错误
我在Cloud_Firestore中储存了食物和日期,没有时间。把它拿回来会增加时间。 现在我想删除时间,这样就只剩下日期了 我尝试了下面显示的代码,我得到了错误。从dart和cloud_firestore文档中,我找不到更改时间的公共方法。formatter.formatnow错误称为: 代码Datetime 将时间戳转换为无时间日期的颤振镖错误,datetime,flutter,dart,google-cloud-firestore,intl,Datetime,Flutter,Dart,Google Cloud Firestore,Intl,我在Cloud_Firestore中储存了食物和日期,没有时间。把它拿回来会增加时间。 现在我想删除时间,这样就只剩下日期了 我尝试了下面显示的代码,我得到了错误。从dart和cloud_firestore文档中,我找不到更改时间的公共方法。formatter.formatnow错误称为: 代码 当在引号中使用DateTime时,可以将其转换为字符串,并且不会在编译时出错,因为您将其分配给var而不是DateTime。在大多数情况下,避免使用var,并明确变量的类型 DateTime now =
当在引号中使用DateTime时,可以将其转换为字符串,并且不会在编译时出错,因为您将其分配给var而不是DateTime。在大多数情况下,避免使用var,并明确变量的类型
DateTime now = doc.data['Date'].toDate();
DateFormat formatter = DateFormat('dd-MM-yyyy');
String formatted = formatter.format(now);
import 'package:flutter/material.dart';
import 'package:mealapp/models/Widgets/whenAndWhatToEat.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:intl/intl.dart';
import 'package:mealapp/models/global.dart';
class MealTile extends StatefulWidget {
final MealsAndWhen mealsAndWhen;
MealTile ({ this.mealsAndWhen });
@override
MealTileState createState() {
return MealTileState();
}
}
class MealTileState extends State<MealTile> {
String id;
final db = Firestore.instance;
String meal;
Widget buildItem(DocumentSnapshot doc) {
var now = '${doc.data['Date'].toDate()}';
var formatter = new DateFormat('dd-MM-yyyy');
String formatted = formatter.format(now);
print (formatted);
return Container(
margin: const EdgeInsets.all(8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Text(
'Meal: ${doc.data['Meal']}',
style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold, color: Colors.white),
textAlign: TextAlign.center,
),
Text(
'Date: ${doc.data['Date']}',
style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold, color: Colors.white),
textAlign: TextAlign.center,
),
SizedBox(height: 12),
Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
SizedBox(width: 8),
FlatButton(
onPressed: () => deleteData(doc),
child: Text('Delete',
style: TextStyle(fontWeight: FontWeight.bold,
color: Colors.white)
),
),
],
),
],
),
decoration: BoxDecoration(
color: lightBlueColor,
borderRadius: BorderRadius.all(Radius.circular(12)),
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: darkGreyColor,
body: ListView(
padding: EdgeInsets.only(top: 220),
children: <Widget>[
StreamBuilder<QuerySnapshot>(
stream: db.collection('mealList').snapshots(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return Column(children: snapshot.data.documents.map((doc) => buildItem(doc)).toList());
} else {
return SizedBox();
}
},
)
],
),
);
}
void deleteData(DocumentSnapshot doc) async {
await db.collection('mealList').document(doc.documentID).delete();
setState(() => id = null);
}
}
DateTime now = doc.data['Date'].toDate();
DateFormat formatter = DateFormat('dd-MM-yyyy');
String formatted = formatter.format(now);