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陽(yáng)歷轉(zhuǎn)陰歷

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

public class Lunar {
     private int year;
     private int month;
     private int day;
     private boolean leap;
     final static String chineseNumber[] = { " 一 " , " 二 " , " 三 " , " 四 " , " 五 " , " 六 " , " 七 " , " 八 " , " 九 " , " 十 " , " 十一 " , " 十二 " } ;
     static SimpleDateFormat chineseDateFormat = new SimpleDateFormat( " yyyy年MM月dd日 " );
     final static long [] lunarInfo = new long []
     { 0x04bd8 , 0x04ae0 , 0x0a570 , 0x054d5 , 0x0d260 , 0x0d950 , 0x16554 , 0x056a0 , 0x09ad0 , 0x055d2 ,
      0x04ae0 , 0x0a5b6 , 0x0a4d0 , 0x0d250 , 0x1d255 , 0x0b540 , 0x0d6a0 , 0x0ada2 , 0x095b0 , 0x14977 ,
      0x04970 , 0x0a4b0 , 0x0b4b5 , 0x06a50 , 0x06d40 , 0x1ab54 , 0x02b60 , 0x09570 , 0x052f2 , 0x04970 ,
      0x06566 , 0x0d4a0 , 0x0ea50 , 0x06e95 , 0x05ad0 , 0x02b60 , 0x186e3 , 0x092e0 , 0x1c8d7 , 0x0c950 ,
      0x0d4a0 , 0x1d8a6 , 0x0b550 , 0x056a0 , 0x1a5b4 , 0x025d0 , 0x092d0 , 0x0d2b2 , 0x0a950 , 0x0b557 ,
      0x06ca0 , 0x0b550 , 0x15355 , 0x04da0 , 0x0a5d0 , 0x14573 , 0x052d0 , 0x0a9a8 , 0x0e950 , 0x06aa0 ,
      0x0aea6 , 0x0ab50 , 0x04b60 , 0x0aae4 , 0x0a570 , 0x05260 , 0x0f263 , 0x0d950 , 0x05b57 , 0x056a0 ,
      0x096d0 , 0x04dd5 , 0x04ad0 , 0x0a4d0 , 0x0d4d4 , 0x0d250 , 0x0d558 , 0x0b540 , 0x0b5a0 , 0x195a6 ,
      0x095b0 , 0x049b0 , 0x0a974 , 0x0a4b0 , 0x0b27a , 0x06a50 , 0x06d40 , 0x0af46 , 0x0ab60 , 0x09570 ,
      0x04af5 , 0x04970 , 0x064b0 , 0x074a3 , 0x0ea50 , 0x06b58 , 0x055c0 , 0x0ab60 , 0x096d5 , 0x092e0 ,
      0x0c960 , 0x0d954 , 0x0d4a0 , 0x0da50 , 0x07552 , 0x056a0 , 0x0abb7 , 0x025d0 , 0x092d0 , 0x0cab5 ,
      0x0a950 , 0x0b4a0 , 0x0baa4 , 0x0ad50 , 0x055d9 , 0x04ba0 , 0x0a5b0 , 0x15176 , 0x052b0 , 0x0a930 ,
      0x07954 , 0x06aa0 , 0x0ad50 , 0x05b52 , 0x04b60 , 0x0a6e6 , 0x0a4e0 , 0x0d260 , 0x0ea65 , 0x0d530 ,
      0x05aa0 , 0x076a3 , 0x096d0 , 0x04bd7 , 0x04ad0 , 0x0a4d0 , 0x1d0b6 , 0x0d250 , 0x0d520 , 0x0dd45 ,
      0x0b5a0 , 0x056d0 , 0x055b2 , 0x049b0 , 0x0a577 , 0x0a4b0 , 0x0aa50 , 0x1b255 , 0x06d20 , 0x0ada0 } ;

     // ====== 傳回農(nóng)歷 y年的總天數(shù)
     final private static int yearDays( int y) {
         int i, sum = 348 ;
         for (i = 0x8000 ; i > 0x8 ; i >>= 1 ) {
             if ((lunarInfo[y - 1900 ] & i) != 0 ) sum += 1 ;
        }
         return (sum + leapDays(y));
    }

     // ====== 傳回農(nóng)歷 y年閏月的天數(shù)
     final private static int leapDays( int y) {
         if (leapMonth(y) != 0 ) {
             if ((lunarInfo[y - 1900 ] & 0x10000 ) != 0 )
                 return 30 ;
             else
                 return 29 ;
        } else
             return 0 ;
    }

     // ====== 傳回農(nóng)歷 y年閏哪個(gè)月 1-12 , 沒(méi)閏傳回 0
     final private static int leapMonth( int y) {
         return ( int ) (lunarInfo[y - 1900 ] & 0xf );
    }

     // ====== 傳回農(nóng)歷 y年m月的總天數(shù)
     final private static int monthDays( int y, int m) {
         if ((lunarInfo[y - 1900 ] & ( 0x10000 >> m)) == 0 )
             return 29 ;
         else
             return 30 ;
    }

     // ====== 傳回農(nóng)歷 y年的生肖
     final public String animalsYear() {
         final String[] Animals = new String[] { " 鼠 " , " 牛 " , " 虎 " , " 兔 " , " 龍 " , " 蛇 " , " 馬 " , " 羊 " , " 猴 " , " 雞 " , " 狗 " , " 豬 " } ;
         return Animals[(year - 4 ) % 12 ];
    }

     // ====== 傳入月日的offset 傳回干支, 0=甲子
     final private static String cyclicalm( int num) {
         final String[] Gan = new String[] { " 甲 " , " 乙 " , " 丙 " , " 丁 " , " 戊 " , " 己 " , " 庚 " , " 辛 " , " 壬 " , " 癸 " } ;
         final String[] Zhi = new String[] { " 子 " , " 丑 " , " 寅 " , " 卯 " , " 辰 " , " 巳 " , " 午 " , " 未 " , " 申 " , " 酉 " , " 戌 " , " 亥 " } ;
         return (Gan[num % 10 ] + Zhi[num % 12 ]);
    }

     // ====== 傳入 offset 傳回干支, 0=甲子
     final public String cyclical() {
         int num = year - 1900 + 36 ;
         return (cyclicalm(num));
    }

     /**
     * 傳出y年m月d日對(duì)應(yīng)的農(nóng)歷.
     * yearCyl3:農(nóng)歷年與1864的相差數(shù)              ?
     * monCyl4:從1900年1月31日以來(lái),閏月數(shù)
     * dayCyl5:與1900年1月31日相差的天數(shù),再加40      ?
     * @param cal
     * @return
      */
     public Lunar(Calendar cal) {
        @SuppressWarnings( " unused " ) int yearCyl, monCyl, dayCyl;
         int leapMonth = 0 ;
        Date baseDate = null ;
         try {
            baseDate = chineseDateFormat.parse( " 1900年1月31日 " );
        } catch (ParseException e) {
            e.printStackTrace();   // To change body of catch statement use Options | File Templates.
        }

         // 求出和1900年1月31日相差的天數(shù)
         int offset = ( int ) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L );
        dayCyl = offset + 40 ;
        monCyl = 14 ;

         // 用offset減去每農(nóng)歷年的天數(shù)
         // 計(jì)算當(dāng)天是農(nóng)歷第幾天
         // i最終結(jié)果是農(nóng)歷的年份
         // offset是當(dāng)年的第幾天
         int iYear, daysOfYear = 0 ;
         for (iYear = 1900 ; iYear < 2050 && offset > 0 ; iYear ++ ) {
            daysOfYear = yearDays(iYear);
            offset -= daysOfYear;
            monCyl += 12 ;
        }
         if (offset < 0 ) {
            offset += daysOfYear;
            iYear -- ;
            monCyl -= 12 ;
        }
         // 農(nóng)歷年份
        year = iYear;

        yearCyl = iYear - 1864 ;
        leapMonth = leapMonth(iYear); // 閏哪個(gè)月,1-12
        leap = false ;

         // 用當(dāng)年的天數(shù)offset,逐個(gè)減去每月（農(nóng)歷）的天數(shù)，求出當(dāng)天是本月的第幾天
         int iMonth, daysOfMonth = 0 ;
         for (iMonth = 1 ; iMonth < 13 && offset > 0 ; iMonth ++ ) {
             // 閏月
             if (leapMonth > 0 && iMonth == (leapMonth + 1 ) && ! leap) {
                 -- iMonth;
                leap = true ;
                daysOfMonth = leapDays(year);
            } else
                daysOfMonth = monthDays(year, iMonth);

            offset -= daysOfMonth;
             // 解除閏月
             if (leap && iMonth == (leapMonth + 1 )) leap = false ;
             if ( ! leap) monCyl ++ ;
        }
         // offset為0時(shí)，并且剛才計(jì)算的月份是閏月，要校正
         if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1 ) {
             if (leap) {
                leap = false ;
            } else {
                leap = true ;
                 -- iMonth;
                 -- monCyl;
            }
        }
         // offset小于0時(shí)，也要校正
         if (offset < 0 ) {
            offset += daysOfMonth;
             -- iMonth;
             -- monCyl;
        }
        month = iMonth;
        day = offset + 1 ;
    }

     public static String getChinaDayString( int day) {
        String chineseTen[] = { " 初 " , " 十 " , " 廿 " , " 卅 " } ;
         int n = day % 10 == 0 ? 9 : day % 10 - 1 ;
         if (day > 30 )
             return "" ;
         if (day == 10 )
             return " 初十 " ;
         else
             return chineseTen[day / 10 ] + chineseNumber[n];
    }

     public String toString() {
         return year + " 年 " + (leap ? " 閏 " : "" ) + chineseNumber[month - 1 ] + " 月 " + getChinaDayString(day);
    }

     public static void main(String[] args) throws ParseException {
        Calendar today = Calendar.getInstance();
        today.setTime(chineseDateFormat.parse( " 2003年1月1日 " ));
        Lunar lunar = new Lunar(today);

        System.out.println( " 北京時(shí)間： " + chineseDateFormat.format(today.getTime()) + " 　農(nóng)歷 " + lunar);
    }
}

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