Convert String to DateTime in flutter

Question

I have this code

if (obj.due_date != null) {
      print('The date is  '+obj.due_date);
      print('now change to ' +
       DateUtil().formattedDate(DateTime.parse(obj.due_date)));
 }

DateUtil

import 'package:intl/intl.dart';

class DateUtil {
  static const DATE_FORMAT = 'dd/MM/yyyy';
  String formattedDate(DateTime dateTime) {
    print('dateTime ($dateTime)');
    return DateFormat(DATE_FORMAT).format(dateTime);
  }
}

My output become this

I/flutter ( 5209): The date is 2019-11-20T00:00:00.000+08:00

I/flutter ( 5209): dateTime (2019-11-19 16:00:00.000Z)

I/flutter ( 5209): now change to 19/11/2019

Why it will change from 20 to 19?

Answer 1

It is because of the value that you hold in

obj.due_date

As per the log, the current value is

2019-11-20T00:00:00.000+08:00

When I used the below code

var tempDate = '2019-11-20T00:00:00.000+00:00';
print('The date is  '+tempDate);
print('now change to ' +DateUtil().formattedDate(DateTime.parse(tempDate)));

the logs are as follows:

I/flutter (18268): The date is  2019-11-20T00:00:00.000+00:00
I/flutter (18268): dateTime (2019-11-20 00:00:00.000Z)
I/flutter (18268): now change to 20/11/2019

The only change between these codes is the value that we pass.

2019-11-20T00:00:00.000+00:00

It is purely a timezone issue.

Try below code

var tempDate = DateTime.now().toLocal().toString();

Log show

I/flutter (18268): 2019-11-15 16:06:54.786814
I/flutter (18268): The date is  2019-11-15 16:06:54.787186
I/flutter (18268): dateTime (2019-11-15 16:06:54.787186)
I/flutter (18268): now change to 15/11/2019

Likewise, when you use the following code

var tempDate = DateTime.now().toUtc().toString();

the logs are as follows:

I/flutter (18268): 2019-11-15 16:07:35.078897 
I/flutter (18268): The date is  2019-11-15 05:07:35.079251Z 
I/flutter (18268): dateTime (2019-11-15 05:07:35.079251Z) 
I/flutter (18268): now change to 15/11/2019

Hence the final answer is, change below line

DateUtil().formattedDate(DateTime.parse(tempDate)));

to

DateUtil().formattedDate(DateTime.parse(tempDate).toLocal())