Main.java

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import java.util.Calendar;
import java.util.Date;

public class Main {
    public static void main(String[] args) {
        LunarMonthCalendar.LunarDate ld = new LunarMonthCalendar.LunarDate();
        Date d = new Date();
        Calendar c = Calendar.getInstance();
        c.setTime(d);
        ld = LunarMonthCalendar.GetLunarDate(c.get(Calendar.YEAR), c.get(Calendar.MONTH) + 1, c.get(Calendar.DAY_OF_MONTH));
        System.out.printf("%d/%d\n", ld.Month, ld.Day);
        if (ld.IsLeap) System.out.println("Leap");
    }
}

class LunarMonthCalendar {
    private static int LunarCalendarDay;
    private static final int[] LunarCalendarTable = {
        0x04AE53,0x0A5748,0x5526BD,0x0D2650,0x0D9544,0x46AAB9,0x056A4D,0x09AD42,0x24AEB6,0x04AE4A,/*1901-1910*/
        0x6A4DBE,0x0A4D52,0x0D2546,0x5D52BA,0x0B544E,0x0D6A43,0x296D37,0x095B4B,0x749BC1,0x049754,/*1911-1920*/
        0x0A4B48,0x5B25BC,0x06A550,0x06D445,0x4ADAB8,0x02B64D,0x095742,0x2497B7,0x04974A,0x664B3E,/*1921-1930*/
        0x0D4A51,0x0EA546,0x56D4BA,0x05AD4E,0x02B644,0x393738,0x092E4B,0x7C96BF,0x0C9553,0x0D4A48,/*1931-1940*/
        0x6DA53B,0x0B554F,0x056A45,0x4AADB9,0x025D4D,0x092D42,0x2C95B6,0x0A954A,0x7B4ABD,0x06CA51,/*1941-1950*/
        0x0B5546,0x555ABB,0x04DA4E,0x0A5B43,0x352BB8,0x052B4C,0x8A953F,0x0E9552,0x06AA48,0x6AD53C,/*1951-1960*/
        0x0AB54F,0x04B645,0x4A5739,0x0A574D,0x052642,0x3E9335,0x0D9549,0x75AABE,0x056A51,0x096D46,/*1961-1970*/
        0x54AEBB,0x04AD4F,0x0A4D43,0x4D26B7,0x0D254B,0x8D52BF,0x0B5452,0x0B6A47,0x696D3C,0x095B50,/*1971-1980*/
        0x049B45,0x4A4BB9,0x0A4B4D,0xAB25C2,0x06A554,0x06D449,0x6ADA3D,0x0AB651,0x093746,0x5497BB,/*1981-1990*/
        0x04974F,0x064B44,0x36A537,0x0EA54A,0x86B2BF,0x05AC53,0x0AB647,0x5936BC,0x092E50,0x0C9645,/*1991-2000*/
        0x4D4AB8,0x0D4A4C,0x0DA541,0x25AAB6,0x056A49,0x7AADBD,0x025D52,0x092D47,0x5C95BA,0x0A954E,/*2001-2010*/
        0x0B4A43,0x4B5537,0x0AD54A,0x955ABF,0x04BA53,0x0A5B48,0x652BBC,0x052B50,0x0A9345,0x474AB9,/*2011-2020*/
        0x06AA4C,0x0AD541,0x24DAB6,0x04B64A,0x69573D,0x0A4E51,0x0D2646,0x5E933A,0x0D534D,0x05AA43,/*2021-2030*/
        0x36B537,0x096D4B,0xB4AEBF,0x04AD53,0x0A4D48,0x6D25BC,0x0D254F,0x0D5244,0x5DAA38,0x0B5A4C,/*2031-2040*/
        0x056D41,0x24ADB6,0x049B4A,0x7A4BBE,0x0A4B51,0x0AA546,0x5B52BA,0x06D24E,0x0ADA42,0x355B37,/*2041-2050*/
        0x09374B,0x8497C1,0x049753,0x064B48,0x66A53C,0x0EA54F,0x06B244,0x4AB638,0x0AAE4C,0x092E42,/*2051-2060*/
        0x3C9735,0x0C9649,0x7D4ABD,0x0D4A51,0x0DA545,0x55AABA,0x056A4E,0x0A6D43,0x452EB7,0x052D4B,/*2061-2070*/
        0x8A95BF,0x0A9553,0x0B4A47,0x6B553B,0x0AD54F,0x055A45,0x4A5D38,0x0A5B4C,0x052B42,0x3A93B6,/*2071-2080*/
        0x069349,0x7729BD,0x06AA51,0x0AD546,0x54DABA,0x04B64E,0x0A5743,0x452738,0x0D264A,0x8E933E,/*2081-2090*/
        0x0D5252,0x0DAA47,0x66B53B,0x056D4F,0x04AE45,0x4A4EB9,0x0A4D4C,0x0D1541,0x2D92B5          /*2091-2099*/
    };
    protected static final int[] MonthAdd = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
    protected static int LunarCalendar(int year, int month, int day) {
        int Spring_SY, Sun_SY, StaticDayCount;
        int index, flag;
        if (((LunarCalendarTable[year - 1901] & 0x0060) >> 5) == 1)
            Spring_SY = (LunarCalendarTable[year - 1901] & 0x001F) - 1;
        else
            Spring_SY = (LunarCalendarTable[year - 1901] & 0x001F) + 30;
        Sun_SY = MonthAdd[month - 1] + day - 1;
        if ((year % 4 == 0) && (month > 2))
            ++Sun_SY;
        if (Sun_SY >= Spring_SY) {
            Sun_SY -= Spring_SY;
            month = 1;
            index = 1;
            flag = 0;
            if ((LunarCalendarTable[year - 1901] & (0x80000 >> (index - 1))) == 0)
                StaticDayCount = 29;
            else
                StaticDayCount = 30;
            while (Sun_SY >= StaticDayCount) {
                Sun_SY -= StaticDayCount;
                ++index;
                if (month == ((LunarCalendarTable[year - 1901] & 0xF00000) >> 20))
                {
                    flag = ~flag;
                    if (flag == 0) ++month;
                }
                else ++month;
                if ((LunarCalendarTable[year - 1901] & (0x80000 >> (index - 1))) == 0)
                    StaticDayCount = 29;
                else
                    StaticDayCount = 30;
            }
            day = Sun_SY + 1;
        }
        else {
            Spring_SY -= Sun_SY;
            --year;
            month = 12;
            if (((LunarCalendarTable[year - 1901] & 0xF00000) >> 20) == 0)
                index = 12;
            else
                index = 13;
            flag = 0;
            if ((LunarCalendarTable[year - 1901] & (0x80000 >> (index - 1))) == 0)
                StaticDayCount = 29;
            else
                StaticDayCount = 30;
            while (Spring_SY > StaticDayCount) {
                Spring_SY -= StaticDayCount;
                --index;
                if (flag == 0) --month;
                if (month == ((LunarCalendarTable[year - 1901] & 0xF00000) >> 20))
                    flag = ~flag;
                if ((LunarCalendarTable[year - 1901] & (0x80000 >> (index - 1))) == 0)
                    StaticDayCount = 29;
                else
                    StaticDayCount = 30;
            }
            day = StaticDayCount - Spring_SY + 1;
        }
        LunarCalendarDay |= day;
        LunarCalendarDay |= (month << 6);
        if (month == ((LunarCalendarTable[year - 1901] & 0xF00000) >> 20))
            return 1;
        else
            return 0;
    }
    public static boolean IsLeap(int year, int month, int day) {
        return (LunarCalendar(year, month, day) == 1);
    }
    public static class LunarDate {
        public int Month;
        public int Day;
        public boolean IsLeap;
    }
    public static LunarDate GetLunarDate(int year, int month, int day) {
        LunarDate ld = new LunarDate();
        LunarCalendarDay = 0;
        if (LunarCalendar(year, month, day) != 0)
            ld.IsLeap = true;
        ld.Month = (LunarCalendarDay & 0x3C0) >> 6;
        ld.Day = LunarCalendarDay & 0x3F;
        return ld;
    }
}