Dart: Datetime

Carlos Costa

The class Datetime is a combination of date and time along with the time zone. It is used to perform various date-time operations like formatting, parsing, timezones, etc.

Example:

void main() {
  var now = DateTime.now();
  print(now); // 2021-08-22 16:00:00.000
}

Creating a specific date:

void main() {
  var date = DateTime(2021, 08, 22);
  print(date); // 2021-08-22 00:00:00.000
}

Split the date and time:

void main() {
  var now = DateTime.now();
  print(now.year); // 2021
  print(now.month); // 8
  print(now.day); // 22
  print(now.hour); // 16
  print(now.minute); // 0
  print(now.second); // 0
  print(now.millisecond); // 0
  print(now.microsecond); // 0
}

We can manipulate for data and adding or subtracting days, months, years, etc.

Example: Adding 2 days and 13 hours to the current date:

void main() {
  var now = DateTime.now();
  var newDate = now.add(Duration(days: 2, hours: 13));
  print(newDate);
}

Another example: Subtracting 2 days and 13 hours to the current date:

void main() {
  var now = DateTime.now();
  var newDate = now.subtract(Duration(days: 2, hours: 13));
  print(newDate);
}

Another example more complex:

📅 If my bride and I are going to get married in 2 years, 3 months and 5 days, what date will it be?

var now = DateTime.now();
var weddingDate = DateTime(now.year + 2, now.month + 3, now.day + 5);
print(weddingDate);

We can also compare dates:

void main() {
  var now = DateTime.now();
  var newDate = now.add(Duration(days: 2, hours: 13));
  print(now.isBefore(newDate)); // true
  print(now.isAfter(newDate)); // false
}

Intl

Intl is a package provided by Dart to perform internationalization (i18n) and localization (l10n) tasks, such as formatting dates, numbers, and strings into language-specific messages, and performing bidirectional text transformations.

Example:

import 'package:intl/intl.dart';

void main() {
  var now = DateTime.now();

  DateFormat.MMMMd().format(now); // July 10
  DateFormat.yMMMMd().format(now); // July 10, 2019
  DateFormat.yMd().format(now); // 7/10/2019
  DateFormat('EEEE, d MMMM, yyyy').format(now); // Wednesday, 10 July, 2019
  DateFormat('kk:mm:ss').format(now); // 14:18:02
  DateFormat('hh:mm a').format(now); // 02:18 PM
  DateFormat('yyyy-MM-dd – kk:mm').format(now); // 2019-07-10 – 14:18
}

Intl

References