Java指定の西暦日付対応する旧暦/陰暦の日付を計算

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 *   ！              ，       。 ，             。   ： Calendar cal =
 * Calendar.getInstance(); cal.set(1973,4,5); Lunar lunar = new Lunar(cal);
 * System.out.println(lunar.toString());//        
 * 
 * */

public class Lunar {
	private int year;
	private int month;
	private int day;
	private boolean leap;
	final static String chineseNumber[] = { " ", " ", " ", " ", " ", " ", " ",
			" ", " ", " ", "  ", " " };
	final static String chineseNumber1[] = { " ", " ", " ", " ", " ", " ", " ",
			" ", " ", " ", "  ", "  " };
	static SimpleDateFormat chineseDateFormat = new SimpleDateFormat(
			"yyyy MM dd ");

	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 };

	// ======      y     
	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));
	}

	// ======      y      
	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;
	}

	// ======      y      1-12 ,      0
	final private static int leapMonth(int y) {
		return (int) (lunarInfo[y - 1900] & 0xf);
	}

	// ======      y m     
	final private static int monthDays(int y, int m) {
		if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0)
			return 29;
		else
			return 30;
	}

	// ======      y    
	final public String animalsYear() {
		final String[] Animals = new String[] { " ", " ", " ", " ", " ", " ",
				" ", " ", " ", " ", " ", " " };
		return Animals[(year - 4) % 12];
	}

	// ======       offset     , 0=  
	final private static String cyclicalm(int num) {
		final String[] Gan = new String[] { " ", " ", " ", " ", " ", " ", " ",
				" ", " ", " " };
		final String[] Zhi = new String[] { " ", " ", " ", " ", " ", " ", " ",
				" ", " ", " ", " ", " " };
		return (Gan[num % 10] + Zhi[num % 12]);
	}

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

	/**
	 *   y m d      . yearCyl3:    1864     ? monCyl4: 1900 1 31   ,   
	 * dayCyl5: 1900 1 31      ,  40 ?
	 * 
	 * @param cal
	 * @return
	 */
	public Lunar(Calendar cal) {
		int yearCyl, monCyl, dayCyl;
		int leapMonth = 0;
		Date baseDate = null;
		try {
			baseDate = chineseDateFormat.parse("1900 1 31 ");
		} catch (ParseException e) {
			e.printStackTrace(); // To change body of catch statement use
									// Options | File Templates.
		}

		//    1900 1 31      
		int offset = (int) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L);
		dayCyl = offset + 40;
		monCyl = 14;

		//  offset         
		//           
		// i          
		// offset       
		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;
		}
		//     
		year = iYear;

		yearCyl = iYear - 1864;
		leapMonth = leapMonth(iYear); //     ,1-12
		leap = false;

		//       offset,      （  ）   ，           
		int iMonth, daysOfMonth = 0;
		for (iMonth = 1; iMonth < 13 && offset > 0; iMonth++) {
			//   
			if (leapMonth > 0 && iMonth == (leapMonth + 1) && !leap) {
				--iMonth;
				leap = true;
				daysOfMonth = leapDays(year);
			} else
				daysOfMonth = monthDays(year, iMonth);

			offset -= daysOfMonth;
			//     
			if (leap && iMonth == (leapMonth + 1))
				leap = false;
			if (!leap)
				monCyl++;
		}
		// offset 0 ，            ，   
		if (offset == 0 && leapMonth > 0 && iMonth == leapMonth + 1) {
			if (leap) {
				leap = false;
			} else {
				leap = true;
				--iMonth;
				--monCyl;
			}
		}
		// offset  0 ，    
		if (offset < 0) {
			offset += daysOfMonth;
			--iMonth;
			--monCyl;
		}
		month = iMonth;
		day = offset + 1;
	}

	public static String getChinaDayString(int day) {
		String chineseTen[] = { " ", " ", " ", " " };

		int n = day % 10 == 0 ? 9 : day % 10 - 1;

		if (day > 30)
			return "";

		if (day == 10)
			return "  ";

		if (day == 20)
			return "  ";

		if (day == 30)
			return "  ";

		return chineseTen[day / 10] + chineseNumber1[n];
	}

	public String toString() {

		return (leap ? " " : "") + chineseNumber[month - 1] + " "
				+ getChinaDayString(day);

	}

	public String getChinaWeekdayString(String weekday) {
		if (weekday.equals("Mon"))
			return " ";
		if (weekday.equals("Tue"))
			return " ";
		if (weekday.equals("Wed"))
			return " ";
		if (weekday.equals("Thu"))
			return " ";
		if (weekday.equals("Fri"))
			return " ";
		if (weekday.equals("Sat"))
			return " ";
		if (weekday.equals("Sun"))
			return " ";
		else
			return "";

	}

	/*
	 * public static void main(String[] args) throws ParseException{ Calendar
	 * today = Calendar.getInstance(); today.setTime(new
	 * java.util.Date());//      
	 * //today.setTime(chineseDateFormat.parse("2006 10 30 "));//        Lunar
	 * lunar = new Lunar(today);
	 * System.out.print(lunar.cyclical()+" ");//        
	 * System.out.println(lunar.toString());//        
	 * System.out.println(lunar.animalsYear());//       System.out.println(new
	 * java.sql.Date(today.getTime().getTime()));//      
	 * System.out.println("  "
	 * +lunar.getChinaWeekdayString(today.getTime().toString
	 * ().substring(0,3)));//        }
	 */

}