c#获取近半年的月份以及近一年的月份

 /// <summary>
 /// 获取近半年的月份
 /// </summary>
 /// <returns></returns>
 public static List<string> GetLastSixMonthss()
 {
     List<string> monthsInLastHalfYear = new List<string>();
     DateTime now = DateTime.Now;
     DateTime startDate = now.AddMonths(-5); // 从当前日期开始向前推6个月

     for (DateTime date = startDate; date <= now; date = date.AddMonths(1))
     {
         monthsInLastHalfYear.Add(date.ToString("yyyy-MM")); // 格式化为年-月
     }
     return monthsInLastHalfYear;
 }

        /// <summary>
        /// 获取近一年的月份
        /// </summary>
        /// <returns></returns>
        public static List<string> RetMonth()
        {
            var dataArr = new List<string>();
            var date = DateTime.Now;
            for (int i = -11; i <= 0; i++)
            {
                var newDate = date.AddMonths(i);
                string m = newDate.Month < 10 ? "0" + Convert.ToString(newDate.Month) : Convert.ToString(newDate.Month);
                dataArr.Add(newDate.Year + "-" + m);
            }
            return dataArr;
        }