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;       }