中国公历算法

中国公历算法不是太难，关键是星期值的确定。这里给出了简单算法：

   public static int dayofweek(int y, int m, int d) {

      int w = 1; // 公历一年一月一日是星期一，所以起始值为星期日

      y = (y-1)%400 + 1; // 公历星期值分部 400 年循环一次

      int ly = (y-1)/4; // 闰年次数

      ly = ly - (y-1)/100;

      ly = ly + (y-1)/400;

      int ry = y - 1 - ly; // 常年次数

      w = w + ry; // 常年星期值增一

      w = w + 2*ly; // 闰年星期值增二

      w = w + dayofyear(y,m,d);

      w = (w-1)%7 + 1;

      return w;

   }

中国农历算法

根公历相比，中国农历的算法相当复杂。我在网上找的算法之中，eleworld.com 的算法是最好的一个。这个算法使用了大量的数据来确定农历月份和节气的分部，它仅实用于公历 1901 年到 2100 年之间的 200 年。

中国农历计算程式

跟据 eleworld.com 提供的算法，我写了下面这个程式：

[html]

/**
 * chinesecalendargb.java
 * copyright (c) 1997-2002 by dr. herong yang. http://www.herongyang.com/
 * 中国农历算法 - 实用于公历 1901 年至 2100 年之间的 200 年
 */
import java.text.*;
import java.util.*;
class chinesecalendargb {
   private int gregorianyear;
   private int gregorianmonth;
   private int gregoriandate;
   private boolean isgregorianleap;
   private int dayofyear;
   private int dayofweek; // 周日一星期的第一天
   private int chineseyear;
   private int chinesemonth; // 负数表示闰月
   private int chinesedate;
   private int sectionalterm;
   private int principleterm;
   private static char[] daysingregorianmonth =
      {31,28,31,30,31,30,31,31,30,31,30,31};
   private static string[] stemnames =
      {"甲","乙","丙","丁","戊","己","庚","辛","壬","癸"};
   private static string[] branchnames =
      {"子","丑","寅","卯","辰","巳","午","未","申","酉","戌","亥"};
   private static string[] animalnames =
      {"鼠","牛","虎","兔","龙","蛇","马","羊","猴","鸡","狗","猪"};
   public static void main(string[] arg) {
      chinesecalendargb c = new chinesecalendargb();
      string cmd = "day";
      int y = 1901;
      int m = 1;
      int d = 1;
      if (arg.length>0) cmd = arg[0];
      if (arg.length>1) y = integer.parseint(arg[1]);
      if (arg.length>2) m = integer.parseint(arg[2]);
      if (arg.length>3) d = integer.parseint(arg[3]);
      c.setgregorian(y,m,d);
      c.computechinesefields();
      c.computesolarterms();
      if (cmd.equalsignorecase("year")) {
         string[] t = c.getyeartable();
         for (int i=0; i
      } else if (cmd.equalsignorecase("month")) {
         string[] t = c.getmonthtable();
         for (int i=0; i
      } else {
         system.out.println(c.tostring());
      }
   }
   public chinesecalendargb() {
      setgregorian(1901,1,1);
   }
   public void setgregorian(int y, int m, int d) {
      gregorianyear = y;
      gregorianmonth = m;
      gregoriandate = d;
      isgregorianleap = isgregorianleapyear(y);
      dayofyear = dayofyear(y,m,d);
      dayofweek = dayofweek(y,m,d);
      chineseyear = 0;
      chinesemonth = 0;
      chinesedate = 0;
      sectionalterm = 0;
      principleterm = 0;
   }
   public static boolean isgregorianleapyear(int year) {
      boolean isleap = false;
      if (year%4==0) isleap = true;
      if (year%100==0) isleap = false;
      if (year%400==0) isleap = true;
      return isleap;
   }
   public static int daysingregorianmonth(int y, int m) {
      int d = daysingregorianmonth[m-1];
      if (m==2 && isgregorianleapyear(y)) d++; // 公历闰年二月多一天
      return d;
   }
   public static int dayofyear(int y, int m, int d) {
      int c = 0;
      for (int i=1; i
         c = c + daysingregorianmonth(y,i);
      }
      c = c + d;
      return c;
   }
   public static int dayofweek(int y, int m, int d) {
      int w = 1; // 公历一年一月一日是星期一，所以起始值为星期日
      y = (y-1)%400 + 1; // 公历星期值分部 400 年循环一次
      int ly = (y-1)/4; // 闰年次数
      ly = ly - (y-1)/100;
      ly = ly + (y-1)/400;
      int ry = y - 1 - ly; // 常年次数
      w = w + ry; // 常年星期值增一
      w = w + 2*ly; // 闰年星期值增二
      w = w + dayofyear(y,m,d);
      w = (w-1)%7 + 1;
      return w;
   }
   private static char[] chinesemonths = {
   // 农历月份大小压缩表，两个字节表示一年。两个字节共十六个二进制位数，
   // 前四个位数表示闰月月份，后十二个位数表示十二个农历月份的大小。
   0x00,0x04,0xad,0x08,0x5a,0x01,0xd5,0x54,0xb4,0x09,0x64,0x05,0x59,0x45,
   0x95,0x0a,0xa6,0x04,0x55,0x24,0xad,0x08,0x5a,0x62,0xda,0x04,0xb4,0x05,
   0xb4,0x55,0x52,0x0d,0x94,0x0a,0x4a,0x2a,0x56,0x02,0x6d,0x71,0x6d,0x01,
   0xda,0x02,0xd2,0x52,0xa9,0x05,0x49,0x0d,0x2a,0x45,0x2b,0x09,0x56,0x01,
   0xb5,0x20,0x6d,0x01,0x59,0x69,0xd4,0x0a,0xa8,0x05,0xa9,0x56,0xa5,0x04,
   0x2b,0x09,0x9e,0x38,0xb6,0x08,0xec,0x74,0x6c,0x05,0xd4,0x0a,0xe4,0x6a,
   0x52,0x05,0x95,0x0a,0x5a,0x42,0x5b,0x04,0xb6,0x04,0xb4,0x22,0x6a,0x05,
   0x52,0x75,0xc9,0x0a,0x52,0x05,0x35,0x55,0x4d,0x0a,0x5a,0x02,0x5d,0x31,
   0xb5,0x02,0x6a,0x8a,0x68,0x05,0xa9,0x0a,0x8a,0x6a,0x2a,0x05,0x2d,0x09,
   0xaa,0x48,0x5a,0x01,0xb5,0x09,0xb0,0x39,0x64,0x05,0x25,0x75,0x95,0x0a,
   0x96,0x04,0x4d,0x54,0xad,0x04,0xda,0x04,0xd4,0x44,0xb4,0x05,0x54,0x85,
   0x52,0x0d,0x92,0x0a,0x56,0x6a,0x56,0x02,0x6d,0x02,0x6a,0x41,0xda,0x02,
   0xb2,0xa1,0xa9,0x05,0x49,0x0d,0x0a,0x6d,0x2a,0x09,0x56,0x01,0xad,0x50,
   0x6d,0x01,0xd9,0x02,0xd1,0x3a,0xa8,0x05,0x29,0x85,0xa5,0x0c,0x2a,0x09,
   0x96,0x54,0xb6,0x08,0x6c,0x09,0x64,0x45,0xd4,0x0a,0xa4,0x05,0x51,0x25,
   0x95,0x0a,0x2a,0x72,0x5b,0x04,0xb6,0x04,0xac,0x52,0x6a,0x05,0xd2,0x0a,
   0xa2,0x4a,0x4a,0x05,0x55,0x94,0x2d,0x0a,0x5a,0x02,0x75,0x61,0xb5,0x02,
   0x6a,0x03,0x61,0x45,0xa9,0x0a,0x4a,0x05,0x25,0x25,0x2d,0x09,0x9a,0x68,
   0xda,0x08,0xb4,0x09,0xa8,0x59,0x54,0x03,0xa5,0x0a,0x91,0x3a,0x96,0x04,
   0xad,0xb0,0xad,0x04,0xda,0x04,0xf4,0x62,0xb4,0x05,0x54,0x0b,0x44,0x5d,
   0x52,0x0a,0x95,0x04,0x55,0x22,0x6d,0x02,0x5a,0x71,0xda,0x02,0xaa,0x05,
   0xb2,0x55,0x49,0x0b,0x4a,0x0a,0x2d,0x39,0x36,0x01,0x6d,0x80,0x6d,0x01,
   0xd9,0x02,0xe9,0x6a,0xa8,0x05,0x29,0x0b,0x9a,0x4c,0xaa,0x08,0xb6,0x08,
   0xb4,0x38,0x6c,0x09,0x54,0x75,0xd4,0x0a,0xa4,0x05,0x45,0x55,0x95,0x0a,
   0x9a,0x04,0x55,0x44,0xb5,0x04,0x6a,0x82,0x6a,0x05,0xd2,0x0a,0x92,0x6a,
   0x4a,0x05,0x55,0x0a,0x2a,0x4a,0x5a,0x02,0xb5,0x02,0xb2,0x31,0x69,0x03,
   0x31,0x73,0xa9,0x0a,0x4a,0x05,0x2d,0x55,0x2d,0x09,0x5a,0x01,0xd5,0x48,
   0xb4,0x09,0x68,0x89,0x54,0x0b,0xa4,0x0a,0xa5,0x6a,0x95,0x04,0xad,0x08,
   0x6a,0x44,0xda,0x04,0x74,0x05,0xb0,0x25,0x54,0x03
   };
   // 初始日，公历农历对应日期：
   // 公历 1901 年 1 月 1 日，对应农历 4598 年 11 月 11 日
   private static int baseyear = 1901;
   private static int basemonth = 1;
   private static int basedate = 1;
   private static int baseindex = 0;
   private static int basechineseyear = 4598-1;
   private static int basechinesemonth = 11;
   private static int basechinesedate = 11;
   public int computechinesefields() {
      if (gregorianyear<1901 || gregorianyear>2100) return 1;
      int startyear = baseyear;
      int startmonth = basemonth;
      int startdate = basedate;
      chineseyear = basechineseyear;
      chinesemonth = basechinesemonth;
      chinesedate = basechinesedate;
      // 第二个对应日，用以提高计算效率
      // 公历 2000 年 1 月 1 日，对应农历 4697 年 11 月 25 日
      if (gregorianyear >= 2000) {
         startyear = baseyear + 99;
         startmonth = 1;
         startdate = 1;
         chineseyear = basechineseyear + 99;

    

        

            

                
                
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