How do I format DateTime with UTC timezone offset?

Question

What type of date format is this?

2020-03-26T00:57:08.000+08:00

I'm using DateFormat class

 DateTime dateTime = DateTime.now();

 print(dateTime.toIso8601String());
 print(dateTime.toLocal());
 print(dateTime.toUtc());

Output

I/flutter (20667): 2020-03-26T01:34:20.826589
I/flutter (20667): 2020-03-26 01:34:20.826589
I/flutter (20667): 2020-03-25 17:34:20.826589Z

I would like to have a date format like the first output I show, which has the +08:00 behind. Which should I use?

Answer 1

There is no direct way of getting that kind of date format as of now. There is a work-around.

• Add the intl package
• import it to your file using import 'package:intl/intl.dart';
• Write the following code:

var dateTime = DateTime.now();
var val      = DateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS").format(dateTime);
var offset   = dateTime.timeZoneOffset;
var hours    = offset.inHours > 0 ? offset.inHours : 1; // For fixing divide by 0

if (!offset.isNegative) {
  val = val +
      "+" +
      offset.inHours.toString().padLeft(2, '0') +
      ":" +
      (offset.inMinutes % (hours * 60)).toString().padLeft(2, '0');
} else {
  val = val +
      "-" +
      (-offset.inHours).toString().padLeft(2, '0') +
      ":" +
      (offset.inMinutes % (hours * 60)).toString().padLeft(2, '0');
}
print(val);