公历转换成农历的C#函数

公历转换成农历的C#函数 :

//天干 
         private static string[] TianGan = { "甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸" };

         //地支 
         private static string[] DiZhi = { "子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥" };

         //十二生肖 
         private static string[] ShengXiao = { "鼠", "牛", "虎", "兔", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪" };

         //农历日期 
         private static string[] DayName = {"*","初一","初二","初三","初四","初五", 
                                                 "初六","初七","初八","初九","初十", 
                                                 "十一","十二","十三","十四","十五", 
                                                 "十六","十七","十八","十九","二十", 
                                                 "廿一","廿二","廿三","廿四","廿五", 
                                                 "廿六","廿七","廿八","廿九","三十"};

         //农历月份 
         private static string[] MonthName = { "*", "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "腊" };

         //公历月计数天 
         private static int[] MonthAdd = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
         //农历数据 
         private static int[] LunarData = {2635,333387,1701,1748,267701,694,2391,133423,1175,396438 
                                             ,3402,3749,331177,1453,694,201326,2350,465197,3221,3402 
                                             ,400202,2901,1386,267611,605,2349,137515,2709,464533,1738 
                                             ,2901,330421,1242,2651,199255,1323,529706,3733,1706,398762 
                                             ,2741,1206,267438,2647,1318,204070,3477,461653,1386,2413 
                                             ,330077,1197,2637,268877,3365,531109,2900,2922,398042,2395 
                                             ,1179,267415,2635,661067,1701,1748,398772,2742,2391,330031 
                                             ,1175,1611,200010,3749,527717,1452,2742,332397,2350,3222 
                                             ,268949,3402,3493,133973,1386,464219,605,2349,334123,2709 
                                             ,2890,267946,2773,592565,1210,2651,395863,1323,2707,265877};
         /// <summary> 
         /// 获取对应日期的农历 
         /// </summary> 
         /// <param name="dtDay">公历日期</param> 
         /// <returns></returns> 
         public string GetLunarCalendar(DateTime dtDay)
         {
             string sYear = dtDay.Year.ToString();
             string sMonth = dtDay.Month.ToString();
             string sDay = dtDay.Day.ToString();
             int year;
             int month;
             int day;
             try
             {
                 year = int.Parse(sYear);
                 month = int.Parse(sMonth);
                 day = int.Parse(sDay);
             }
             catch
             {
                 year = DateTime.Now.Year;
                 month = DateTime.Now.Month;
                 day = DateTime.Now.Day;
             }

             int nTheDate;
             int nIsEnd;
             int k, m, n, nBit, i;
             string calendar = string.Empty;
             //计算到初始时间1921年2月8日的天数：1921-2-8(正月初一) 
             nTheDate = (year - 1921) * 365 + (year - 1921) / 4 + day + MonthAdd[month - 1] - 38;
             if ((year % 4 == 0) && (month > 2))
                 nTheDate += 1;
             //计算天干，地支，月，日 
             nIsEnd = 0;
             m = 0;
             k = 0;
             n = 0;
             while (nIsEnd != 1)
             {
                 if (LunarData[m] < 4095)
                     k = 11;
                 else
                     k = 12;
                 n = k;
                 while (n >= 0)
                 {
                     //获取LunarData[m]的第n个二进制位的值 
                     nBit = LunarData[m];
                     for (i = 1; i < n + 1; i++)
                         nBit = nBit / 2;
                     nBit = nBit % 2;
                     if (nTheDate <= (29 + nBit))
                     {
                         nIsEnd = 1;
                         break;
                     }
                     nTheDate = nTheDate - 29 - nBit;
                     n = n - 1;
                 }
                 if (nIsEnd == 1)
                     break;
                 m = m + 1;
             }
             year = 1921 + m;
             month = k - n + 1;
             day = nTheDate;
             //return year + "-" + month + "-" + day;

             if (k == 12)
             {
                 if (month == LunarData[m] / 65536 + 1)
                     month = 1 - month;
                 else if (month > LunarData[m] / 65536 + 1)
                     month = month - 1;
             }
             //年
             calendar = year + "年";
             //生肖 
             calendar += ShengXiao[(year - 4) % 60 % 12].ToString() + "年 ";
             // //天干 
             calendar += TianGan[(year - 4) % 60 % 10].ToString(); 
             // //地支 
             calendar += DiZhi[(year - 4) % 60 % 12].ToString() + " ";

             //农历月 
             if (month < 1)
                 calendar += "闰" + MonthName[-1 * month].ToString() + "月";
             else
                 calendar += MonthName[month].ToString() + "月";

             //农历日 
             calendar += DayName[day].ToString() + "日";

             return calendar;

         }

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