свойство millisecond

int millisecond

Миллисекунда [0...999].

final date = DateTime.parse('1970-01-01 05:01:01.234567Z');
print(date.millisecond); // 234

Реализация

external int get millisecond;

© 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/millisecond.html