中國(guó)日歷(公歷+農(nóng)歷)算法

1、中國(guó)公歷算法中國(guó)公歷算法不是太難，關(guān)鍵是星期值的確定。這里給出了簡(jiǎn)單算法： public static int dayOfWeek(int y, int m, int d) int w = 1; / 公歷一年一月一日是星期一，所以起始值為星期日 y = (y-1)%400 + 1; / 公歷星期值分部 400 年循環(huán)一次 int ly = (y-1)/4; / 閏年次數(shù) ly = ly - (y-1)/100; ly = ly + (y-1)/400; int ry = y - 1 - ly; / 常年次數(shù) w = w + ry; / 常年星期值增一 w = w + 2*ly; / 閏年星期值

2、增二 w = w + dayOfYear(y,m,d); w = (w-1)%7 + 1; return w; 中國(guó)農(nóng)歷算法根公歷相比，中國(guó)農(nóng)歷的算法相當(dāng)復(fù)雜。我在網(wǎng)上找的算法之中， 的算法是最好的一個(gè)。這個(gè)算法使用了大量的數(shù)據(jù)來(lái)確定農(nóng)歷月份和節(jié)氣的分部，它僅實(shí)用于公歷 1901 年到 2100 年之間的 200 年。中國(guó)農(nóng)歷計(jì)算程式跟據(jù) 提供的算法，我寫(xiě)了下面這個(gè)程式：HTML/* ChineseCalendarGB.java* Copyright (c) 1997-2002 by Dr. Herong Yang. * 中國(guó)農(nóng)歷算法 - 實(shí)用于公歷 1901 年至 2100 年之間的 200

3、 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; / 負(fù)數(shù)表示閏月 p

4、rivate 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 anim

5、alNames = 鼠,牛,虎,兔,龍,蛇,馬,羊,猴,雞,狗,豬; public static void main(String arg) ChineseCalendarGB c = new ChineseCalendarGB(); String cmd = day; int y = 1901; int m = 1; int d = 1; if (arg.length0) cmd = arg0; if (arg.length1) y = Integer.parseInt(arg1); if (arg.length2) m = Integer.parseInt(arg); if (arg.le

6、ngth3) d = Integer.parseInt(arg); c.setGregorian(y,m,d); puteChineseFields(); puteSolarTerms(); 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

7、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

8、; 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 = daysInGregorianM

9、onthm-1; if (m=2 & isGregorianLeapYear(y) d+; / 公歷閏年二月多一天 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; / 公歷一年一月一日是星期一，所以起始值為星期日 y = (y-1)%400 +

10、 1; / 公歷星期值分部 400 年循環(huán)一次 int ly = (y-1)/4; / 閏年次數(shù) ly = ly - (y-1)/100; ly = ly + (y-1)/400; int ry = y - 1 - ly; / 常年次數(shù) w = w + ry; / 常年星期值增一 w = w + 2*ly; / 閏年星期值增二 w = w + dayOfYear(y,m,d); w = (w-1)%7 + 1; return w; private static char chineseMonths = / 農(nóng)歷月份大小壓縮表，兩個(gè)字節(jié)表示一年。兩個(gè)字節(jié)共十六個(gè)二進(jìn)制位數(shù)， / 前四個(gè)位數(shù)表示閏

11、月月份，后十二個(gè)位數(shù)表示十二個(gè)農(nóng)歷月份的大小。 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,0x09,0x5

12、6,0x01, 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, 0xb5,0x0

13、2,0x6a,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

14、,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,

15、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,0

16、x02,0xaa,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, 0

17、x4a,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，公歷農(nóng)歷對(duì)應(yīng)日期： / 公歷 1901 年 1 月 1 日，

18、對(duì)應(yīng)農(nóng)歷 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 co

19、mputeChineseFields() if (gregorianYear2100) return 1; int startYear = baseYear; int startMonth = baseMonth; int startDate = baseDate; chineseYear = baseChineseYear; chineseMonth = baseChineseMonth; chineseDate = baseChineseDate; / 第二個(gè)對(duì)應(yīng)日，用以提高計(jì)算效率 / 公歷 2000 年 1 月 1 日，對(duì)應(yīng)農(nóng)歷 4697 年 11 月 25 日 if (gregori

20、anYear = 2000) startYear = baseYear + 99; startMonth = 1; startDate = 1; chineseYear = baseChineseYear + 99; chineseMonth = 11; chineseDate = 25; int daysDiff = 0; for (int i=startYear; i daysDiff += 365; if (isGregorianLeapYear(i) daysDiff += 1; / leap year for (int i=startMonth; i daysDiff += days

21、InGregorianMonth(gregorianYear,i); daysDiff += gregorianDate - startDate; chineseDate += daysDiff; int lastDate = daysInChineseMonth(chineseYear, chineseMonth); int nextMonth = nextChineseMonth(chineseYear, chineseMonth); while (chineseDatelastDate) if (Math.abs(nextMonth) chineseMonth = nextMonth; chineseDate -= lastDate; lastDate = daysInChineseMonth(chineseYear, chineseMonth); nextMonth = nextChineseMonth(chineseYear, chineseMon