свойство day
День месяца [1..31].
final moonLanding = DateTime.parse('1969-07-20 20:18:04Z');
print(moonLanding.day); // 20 Реализация
external int get day;
© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-core/DateTime/day.html
