Java給定公歷日期計算相應農歷/陰歷日期
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;/** * 注意！此類所得到的農歷日期是正確的，但年份是錯誤的。故，只使用其計算所得的農歷日期。 例如： Calendar cal = * Calendar.getInstance(); cal.set(1973,4,5); Lunar lunar = new Lunar(cal); * System.out.println(lunar.toString());//計算輸出陰歷日期 * * */ public class Lunar { private int year; private int month; private int day; private boolean leap; final static String chineseNumber[] = { "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "臘" }; final static String chineseNumber1[] = { "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 }; // ====== 傳回農歷 y年的總天數 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)); } // ====== 傳回農歷 y年閏月的天數 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; } // ====== 傳回農歷 y年閏哪個月 1-12 , 沒閏傳回 0 final private static int leapMonth(int y) { return (int) (lunarInfo[y - 1900] & 0xf); } // ====== 傳回農歷 y年m月的總天數 final private static int monthDays(int y, int m) { if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0) return 29; else return 30; } // ====== 傳回農歷 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日對應的農歷. yearCyl3:農歷年與1864的相差數 ? monCyl4:從1900年1月31日以來,閏月數 * dayCyl5:與1900年1月31日相差的天數,再加40 ? * * @param cal * @return */ public Lunar(Calendar cal) { 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 int offset = (int) ((cal.getTime().getTime() - baseDate.getTime()) / 86400000L); dayCyl = offset + 40; monCyl = 14; // 用offset減去每農歷年的天數 // 計算當天是農歷第幾天 // i最終結果是農歷的年份 // offset是當年的第幾天 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; } // 農歷年份 year = iYear; yearCyl = iYear - 1864; leapMonth = leapMonth(iYear); // 閏哪個月,1-12 leap = false; // 用當年的天數offset,逐個減去每月（農歷）的天數，求出當天是本月的第幾天 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，并且剛才計算的月份是閏月，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，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"; if (day == 20) return "二十"; if (day == 30) return "三十"; return chineseTen[day / 10] + chineseNumber1[n]; } public String toString() { return (leap ? "閏" : "") + chineseNumber[month - 1] + "月" + getChinaDayString(day); } public String getChinaWeekdayString(String weekday) { if (weekday.equals("Mon")) return "一"; if (weekday.equals("Tue")) return "二"; if (weekday.equals("Wed")) return "三"; if (weekday.equals("Thu")) return "四"; if (weekday.equals("Fri")) return "五"; if (weekday.equals("Sat")) return "六"; if (weekday.equals("Sun")) return "日"; else return ""; } /* * public static void main(String[] args) throws ParseException{ Calendar * today = Calendar.getInstance(); today.setTime(new * java.util.Date());//加載當前日期 * //today.setTime(chineseDateFormat.parse("2006年10月30日"));//加載自定義日期 Lunar * lunar = new Lunar(today); * System.out.print(lunar.cyclical()+"年");//計算輸出陰歷年份 * System.out.println(lunar.toString());//計算輸出陰歷日期 * System.out.println(lunar.animalsYear());//計算輸出屬相 System.out.println(new * java.sql.Date(today.getTime().getTime()));//輸出陽歷日期 * System.out.println("星期" * +lunar.getChinaWeekdayString(today.getTime().toString * ().substring(0,3)));//計算輸出星期幾 } */ } </pre>
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