Dart 获取下周五的日期

我正在尝试制作一个应用程序来倒计时直到下周五，但因此我需要下周五的日期。 非常感谢任何帮助！

Solution

extension DateTimeExtension on DateTime {
  DateTime next(int day) {
    return this.add(
      Duration(
        days: (day - this.weekday) % DateTime.daysPerWeek,
      ),
    );
  }
}

Testing

void main() {
  var today = DateTime.now();
  print(today);
 
  print(today.next(DateTime.friday));
  print(today.next(DateTime.friday).weekday == DateTime.friday);
  
  // Works as expected when the next day is after sunday
  print(today.next(DateTime.monday));
  print(today.next(DateTime.monday).weekday == DateTime.monday);
}

Output

2020-06-24 18:47:40.318
2020-06-26 18:47:40.318
true
2020-06-29 18:47:40.318
true

See this欲了解更多信息DateTime.