Постоянная secondsPerDay
Количество секунд в сутках.
Реализация
static const int secondsPerDay = secondsPerHour * hoursPerDay;
© 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/Duration/secondsPerDay-constant.html
