根据2段时间获取期间的每个周末日期和月末日期

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private DateTime WeekStartTime(DateTime dateTime)
      {
 
          DateTime dt = dateTime;
          int dayOfWeek = -1 * (int)dt.Date.DayOfWeek;
 
          DateTime weekStartTime = dt.AddDays(dayOfWeek + 1);//取本周一
          if (dayOfWeek == 0) //如果今天是周日,则开始时间是上周一
          {
              weekStartTime = weekStartTime.AddDays(-7);
          }
          return weekStartTime.Date;
 
      }
      private List<DateTime> GetSundays(DateTime start, DateTime end)
      {
          var startMonday = WeekStartTime(start);
          var startSunday = startMonday.AddDays(6);
          var endMonday = WeekStartTime(end);
          var endSunday = endMonday.AddDays(6);
          List<DateTime> list = new List<DateTime>();
          TimeSpan sp = endSunday.Subtract(startSunday);
          int dayCount = sp.Days;
          var ceil = Convert.ToInt32(Math.Ceiling(dayCount / (double)7));
          for (int i = 0; i <= ceil; i++)
          {
              var date = startSunday.AddDays(i * 7);
              if (i == ceil)
              {
                  if (date > end)
                  {
                      list.Add(end);
                      break;
                  }
              }
              list.Add(date);
 
          }
          return list;
      }
      private List<DateTime> GetYueMo(DateTime start, DateTime end)
      {
          DateTime startYueChu = start.AddDays(1 - start.Day);  //本月月初
          DateTime startYueMo = startYueChu.AddMonths(1).AddDays(-1);  //本月月末
          var endYueChu = end.AddDays(1 - end.Day);
          var endYueMo = endYueChu.AddMonths(1).AddDays(-1);
          List<DateTime> list = new List<DateTime>();
          TimeSpan sp = endYueMo.Subtract(startYueMo);
          int ms = (endYueMo.Year * 12 + endYueMo.Month) - (startYueMo.Year * 12 + startYueMo.Month);
          for (int i = 0; i <= ms; i++)
          {
              var date = startYueMo.AddMonths(i);
              if (i == ms)
              {
                  if (date > end)
                  {
                      list.Add(end);
                      break;
                  }
              }
              list.Add(date);
 
          }
          return list;
      }

  

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