农历阳历日期互转

public static void main(String[] args) {
//阳历转农历
Lunar lunar = LunarSolarUtil.SolarToLunar(new Solar(2019, 1, 1));
System.err.println(JSON.toJSONString(lunar));

    //农历转阳历
    Solar solar = LunarSolarUtil
        .LunarToSolar(new Lunar(LunarSolarUtil.isleap(2019), 2019, 1, 1));
    System.err.println(JSON.toJSONString(solar));
}

import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;

@AllArgsConstructor
@NoArgsConstructor
class Lunar {

public boolean isleap;
public int lunarYear;
public int lunarMonth;
public int lunarDay;

}

@AllArgsConstructor
@NoArgsConstructor
class Solar {

public int solarYear;
public int solarMonth;
public int solarDay;

}

public class LunarSolarUtil {

/*
 * |----4位闰月|-------------13位1为30天，0为29天|
 */
private static int[] lunar_month_days = {1887, 0x1694, 0x16aa, 0x4ad5, 0xab6, 0xc4b7, 0x4ae,
    0xa56, 0xb52a, 0x1d2a,
    0xd54, 0x75aa, 0x156a, 0x1096d, 0x95c, 0x14ae, 0xaa4d, 0x1a4c, 0x1b2a, 0x8d55, 0xad4,
    0x135a, 0x495d, 0x95c,
    0xd49b, 0x149a, 0x1a4a, 0xbaa5, 0x16a8, 0x1ad4, 0x52da, 0x12b6, 0xe937, 0x92e, 0x1496,
    0xb64b, 0xd4a, 0xda8,
    0x95b5, 0x56c, 0x12ae, 0x492f, 0x92e, 0xcc96, 0x1a94, 0x1d4a, 0xada9, 0xb5a, 0x56c, 0x726e,
    0x125c, 0xf92d,
    0x192a, 0x1a94, 0xdb4a, 0x16aa, 0xad4, 0x955b, 0x4ba, 0x125a, 0x592b, 0x152a, 0xf695, 0xd94,
    0x16aa, 0xaab5,
    0x9b4, 0x14b6, 0x6a57, 0xa56, 0x1152a, 0x1d2a, 0xd54, 0xd5aa, 0x156a, 0x96c, 0x94ae, 0x14ae,
    0xa4c, 0x7d26,
    0x1b2a, 0xeb55, 0xad4, 0x12da, 0xa95d, 0x95a, 0x149a, 0x9a4d, 0x1a4a, 0x11aa5, 0x16a8,
    0x16d4, 0xd2da,
    0x12b6, 0x936, 0x9497, 0x1496, 0x1564b, 0xd4a, 0xda8, 0xd5b4, 0x156c, 0x12ae, 0xa92f, 0x92e,
    0xc96, 0x6d4a,
    0x1d4a, 0x10d65, 0xb58, 0x156c, 0xb26d, 0x125c, 0x192c, 0x9a95, 0x1a94, 0x1b4a, 0x4b55,
    0xad4, 0xf55b,
    0x4ba, 0x125a, 0xb92b, 0x152a, 0x1694, 0x96aa, 0x15aa, 0x12ab5, 0x974, 0x14b6, 0xca57,
    0xa56, 0x1526,
    0x8e95, 0xd54, 0x15aa, 0x49b5, 0x96c, 0xd4ae, 0x149c, 0x1a4c, 0xbd26, 0x1aa6, 0xb54, 0x6d6a,
    0x12da,
    0x1695d, 0x95a, 0x149a, 0xda4b, 0x1a4a, 0x1aa4, 0xbb54, 0x16b4, 0xada, 0x495b, 0x936,
    0xf497, 0x1496,
    0x154a, 0xb6a5, 0xda4, 0x15b4, 0x6ab6, 0x126e, 0x1092f, 0x92e, 0xc96, 0xcd4a, 0x1d4a, 0xd64,
    0x956c, 0x155c,
    0x125c, 0x792e, 0x192c, 0xfa95, 0x1a94, 0x1b4a, 0xab55, 0xad4, 0x14da, 0x8a5d, 0xa5a,
    0x1152b, 0x152a,
    0x1694, 0xd6aa, 0x15aa, 0xab4, 0x94ba, 0x14b6, 0xa56, 0x7527, 0xd26, 0xee53, 0xd54, 0x15aa,
    0xa9b5, 0x96c,
    0x14ae, 0x8a4e, 0x1a4c, 0x11d26, 0x1aa4, 0x1b54, 0xcd6a, 0xada, 0x95c, 0x949d, 0x149a,
    0x1a2a, 0x5b25,
    0x1aa4, 0xfb52, 0x16b4, 0xaba, 0xa95b, 0x936, 0x1496, 0x9a4b, 0x154a, 0x136a5, 0xda4,
    0x15ac};

private static int[] solar_1_1 = {1887, 0xec04c, 0xec23f, 0xec435, 0xec649, 0xec83e, 0xeca51,
    0xecc46, 0xece3a,
    0xed04d, 0xed242, 0xed436, 0xed64a, 0xed83f, 0xeda53, 0xedc48, 0xede3d, 0xee050, 0xee244,
    0xee439, 0xee64d,
    0xee842, 0xeea36, 0xeec4a, 0xeee3e, 0xef052, 0xef246, 0xef43a, 0xef64e, 0xef843, 0xefa37,
    0xefc4b, 0xefe41,
    0xf0054, 0xf0248, 0xf043c, 0xf0650, 0xf0845, 0xf0a38, 0xf0c4d, 0xf0e42, 0xf1037, 0xf124a,
    0xf143e, 0xf1651,
    0xf1846, 0xf1a3a, 0xf1c4e, 0xf1e44, 0xf2038, 0xf224b, 0xf243f, 0xf2653, 0xf2848, 0xf2a3b,
    0xf2c4f, 0xf2e45,
    0xf3039, 0xf324d, 0xf3442, 0xf3636, 0xf384a, 0xf3a3d, 0xf3c51, 0xf3e46, 0xf403b, 0xf424e,
    0xf4443, 0xf4638,
    0xf484c, 0xf4a3f, 0xf4c52, 0xf4e48, 0xf503c, 0xf524f, 0xf5445, 0xf5639, 0xf584d, 0xf5a42,
    0xf5c35, 0xf5e49,
    0xf603e, 0xf6251, 0xf6446, 0xf663b, 0xf684f, 0xf6a43, 0xf6c37, 0xf6e4b, 0xf703f, 0xf7252,
    0xf7447, 0xf763c,
    0xf7850, 0xf7a45, 0xf7c39, 0xf7e4d, 0xf8042, 0xf8254, 0xf8449, 0xf863d, 0xf8851, 0xf8a46,
    0xf8c3b, 0xf8e4f,
    0xf9044, 0xf9237, 0xf944a, 0xf963f, 0xf9853, 0xf9a47, 0xf9c3c, 0xf9e50, 0xfa045, 0xfa238,
    0xfa44c, 0xfa641,
    0xfa836, 0xfaa49, 0xfac3d, 0xfae52, 0xfb047, 0xfb23a, 0xfb44e, 0xfb643, 0xfb837, 0xfba4a,
    0xfbc3f, 0xfbe53,
    0xfc048, 0xfc23c, 0xfc450, 0xfc645, 0xfc839, 0xfca4c, 0xfcc41, 0xfce36, 0xfd04a, 0xfd23d,
    0xfd451, 0xfd646,
    0xfd83a, 0xfda4d, 0xfdc43, 0xfde37, 0xfe04b, 0xfe23f, 0xfe453, 0xfe648, 0xfe83c, 0xfea4f,
    0xfec44, 0xfee38,
    0xff04c, 0xff241, 0xff436, 0xff64a, 0xff83e, 0xffa51, 0xffc46, 0xffe3a, 0x10004e, 0x100242,
    0x100437,
    0x10064b, 0x100841, 0x100a53, 0x100c48, 0x100e3c, 0x10104f, 0x101244, 0x101438, 0x10164c,
    0x101842,
    0x101a35, 0x101c49, 0x101e3d, 0x102051, 0x102245, 0x10243a, 0x10264e, 0x102843, 0x102a37,
    0x102c4b,
    0x102e3f, 0x103053, 0x103247, 0x10343b, 0x10364f, 0x103845, 0x103a38, 0x103c4c, 0x103e42,
    0x104036,
    0x104249, 0x10443d, 0x104651, 0x104846, 0x104a3a, 0x104c4e, 0x104e43, 0x105038, 0x10524a,
    0x10543e,
    0x105652, 0x105847, 0x105a3b, 0x105c4f, 0x105e45, 0x106039, 0x10624c, 0x106441, 0x106635,
    0x106849,
    0x106a3d, 0x106c51, 0x106e47, 0x10703c, 0x10724f, 0x107444, 0x107638, 0x10784c, 0x107a3f,
    0x107c53,
    0x107e48};

private static int GetBitInt(int data, int length, int shift) {
    return (data & (((1 << length) - 1) << shift)) >> shift;
}

// WARNING: Dates before Oct. 1582 are inaccurate
private static long SolarToInt(int y, int m, int d) {
    m = (m + 9) % 12;
    y = y - m / 10;
    return 365 * y + y / 4 - y / 100 + y / 400 + (m * 306 + 5) / 10 + (d - 1);
}

/**
 * @param lunarYear 农历年份
 * @return String of Ganzhi: 甲子年 Tiangan:甲乙丙丁戊己庚辛壬癸<br/> Dizhi: 子丑寅卯辰巳无为申酉戌亥
 */
public static String lunarYearToGanZhi(int lunarYear) {
    final String[] tianGan = {"甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸"};
    final String[] diZhi = {"子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥"};
    return tianGan[(lunarYear - 4) % 10] + diZhi[(lunarYear - 4) % 12] + "年";
}

private static Solar SolarFromInt(long g) {
    long y = (10000 * g + 14780) / 3652425;
    long ddd = g - (365 * y + y / 4 - y / 100 + y / 400);
    if (ddd < 0) {
        y--;
        ddd = g - (365 * y + y / 4 - y / 100 + y / 400);
    }
    long mi = (100 * ddd + 52) / 3060;
    long mm = (mi + 2) % 12 + 1;
    y = y + (mi + 2) / 12;
    long dd = ddd - (mi * 306 + 5) / 10 + 1;
    Solar solar = new Solar();
    solar.solarYear = (int) y;
    solar.solarMonth = (int) mm;
    solar.solarDay = (int) dd;
    return solar;
}

/**
 * 农历转公历
 */
public static Solar LunarToSolar(Lunar lunar) {
    int days = lunar_month_days[lunar.lunarYear - lunar_month_days[0]];
    int leap = GetBitInt(days, 4, 13);
    int offset = 0;
    int loopend = leap;
    if (!lunar.isleap) {
        if (lunar.lunarMonth <= leap || leap == 0) {
            loopend = lunar.lunarMonth - 1;
        } else {
            loopend = lunar.lunarMonth;
        }
    }
    for (int i = 0; i < loopend; i++) {
        offset += GetBitInt(days, 1, 12 - i) == 1 ? 30 : 29;
    }
    offset += lunar.lunarDay;

    int solar11 = solar_1_1[lunar.lunarYear - solar_1_1[0]];

    int y = GetBitInt(solar11, 12, 9);
    int m = GetBitInt(solar11, 4, 5);
    int d = GetBitInt(solar11, 5, 0);

    return SolarFromInt(SolarToInt(y, m, d) + offset - 1);
}

/**
 * 公历转农历
 */
public static Lunar SolarToLunar(Solar solar) {
    Lunar lunar = new Lunar();
    int index = solar.solarYear - solar_1_1[0];
    int data = (solar.solarYear << 9) | (solar.solarMonth << 5) | (solar.solarDay);
    int solar11 = 0;
    if (solar_1_1[index] > data) {
        index--;
    }
    solar11 = solar_1_1[index];
    int y = GetBitInt(solar11, 12, 9);
    int m = GetBitInt(solar11, 4, 5);
    int d = GetBitInt(solar11, 5, 0);
    long offset =
        SolarToInt(solar.solarYear, solar.solarMonth, solar.solarDay) - SolarToInt(y, m, d);

    int days = lunar_month_days[index];
    int leap = GetBitInt(days, 4, 13);

    int lunarY = index + solar_1_1[0];
    int lunarM = 1;
    int lunarD = 1;
    offset += 1;

    for (int i = 0; i < 13; i++) {
        int dm = GetBitInt(days, 1, 12 - i) == 1 ? 30 : 29;
        if (offset > dm) {
            lunarM++;
            offset -= dm;
        } else {
            break;
        }
    }
    lunarD = (int) (offset);
    lunar.lunarYear = lunarY;
    lunar.lunarMonth = lunarM;
    lunar.isleap = false;
    if (leap != 0 && lunarM > leap) {
        lunar.lunarMonth = lunarM - 1;
        if (lunarM == leap + 1) {
            lunar.isleap = true;
        }
    }

    lunar.lunarDay = lunarD;
    return lunar;
}

/**
 * 是否是闰年
 */
public static boolean isleap(int year) {
    return (year % 4 == 0 && year % 100 != 0 || year % 400 == 0);
}

}