C# 公历转农历

/// <summary>

     /// LunDay 的摘要说明。

     /// 用法说明

     /// 直接调用即可,比较简单

     /// </summary>

     public class LunDay

     {

         public LunDay()

         {

             //

             // TODO: 在此处添加构造函数逻辑

             //

         }

         //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;

 

             #region 格式化日期显示为三月廿四

             if (k == 12)

             {

                 if (month == LunarData[m] / 65536 + 1)

                     month = 1 - month;

                 else if (month > LunarData[m] / 65536 + 1)

                     month = month - 1;

             }

 

             //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;

 

             #endregion

         }

     }