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C#公历转农历算法详解

qq123 2018年06月24日 编程语言 115 0

C#公历转农历算法:

[C#]代码

/// <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 
        } 
    }
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