class DateRange {
  DateTime startTime;
  DateTime endTime;

  DateRange(this.startTime, this.endTime);
}

class TimeUtils {
  //获得离当前最近的时间段
  static DateRange getLastDates(Duration duration) {
    DateTime now = DateTime.now();
    DateTime endTime = DateTime(now.year, now.month, now.day, 23, 59, 59);
    DateTime startTime =
        endTime.subtract(duration).add(const Duration(days: 1));
    startTime =
        DateTime(startTime.year, startTime.month, startTime.day, 0, 0, 0);
    return DateRange(startTime, endTime);
  }
}