网上有很多农历公历转换的代码，但是很多都没经过完整的测试。
其实在.net中，已经有了一个类ChineseLunisolarCalendar，有农历公历转换的功能。
但是在windows phone的sdk中，这个类又去了。
于是还得自己实现一下转换。
下面实现了1901-2099年的农历公历转换，并且与ChineseLunisolarCalendar的结果进行了逐一比对。
http://0xmiracle.sinaapp.com/blog/?p=458
public class Lunar
{
public int lunarYear;
public int lunarMonth;
public int lunarDay;
public bool isleap;
}
public class Solar
{
public int solarYear;
public int solarMonth;
public int solarDay;
}
public class LunarSolar
{
/*
* |----4位闰月|-------------13位1为30天，0为29天|
* */
public static int[] lunar_month_days = { 1900, 0x095c, 0x14ae, 0xaa4d, 0x1a4c, 0x1b2a, 0x8d55, 0x0ad4, 0x135a, 0x495d, 0x095c, 0xd49b, 0x149a, 0x1a4a, 0xbaa5, 0x16a8, 0x1ad4, 0x52da, 0x12b6, 0xe937, 0x092e, 0x1496, 0xb64b, 0x0d4a, 0x0da8, 0x95b5, 0x056c, 0x12ae, 0x492f, 0x092e, 0xcc96, 0x1a94, 0x1d4a, 0xada9, 0x0b5a, 0x056c, 0x726e, 0x125c, 0xf92d, 0x192a, 0x1a94, 0xdb4a, 0x16aa, 0x0ad4, 0x955b, 0x04ba, 0x125a, 0x592b, 0x152a, 0xf695, 0x0d94, 0x16aa, 0xaab5, 0x09b4, 0x14b6, 0x6a57, 0x0a56, 0x1152a, 0x1d2a, 0x0d54, 0xd5aa, 0x156a, 0x096c, 0x94ae, 0x14ae, 0x0a4c, 0x7d26, 0x1b2a, 0xeb55, 0x0ad4, 0x12da, 0xa95d, 0x095a, 0x149a, 0x9a4d, 0x1a4a, 0x11aa5, 0x16a8, 0x16d4, 0xd2da, 0x12b6, 0x0936, 0x9497, 0x1496, 0x1564b, 0x0d4a, 0x0da8, 0xd5b4, 0x156c, 0x12ae, 0xa92f, 0x092e, 0x0c96, 0x6d4a, 0x1d4a, 0x10d65, 0x0b58, 0x156c, 0xb26d, 0x125c, 0x192c, 0x9a95, 0x1a94, 0x1b4a, 0x4b55, 0x0ad4, 0xf55b, 0x04ba, 0x125a, 0xb92b, 0x152a, 0x1694, 0x96aa, 0x15aa, 0x12ab5, 0x0974, 0x14b6, 0xca57, 0x0a56, 0x1526, 0x8e95, 0x0d54, 0x15aa, 0x49b5, 0x096c, 0xd4ae, 0x149c, 0x1a4c, 0xbd26, 0x1aa6, 0x0b54, 0x6d6a, 0x12da, 0x1695d, 0x095a, 0x149a, 0xda4b, 0x1a4a, 0x1aa4, 0xbb54, 0x16b4, 0x0ada, 0x495b, 0x0936, 0xf497, 0x1496, 0x154a, 0xb6a5, 0x0da4, 0x15b4, 0x6ab6, 0x126e, 0x1092f, 0x092e, 0x0c96, 0xcd4a, 0x1d4a, 0x0d64, 0x956c, 0x155c, 0x125c, 0x792e, 0x192c, 0xfa95, 0x1a94, 0x1b4a, 0xab55, 0x0ad4, 0x14da, 0x8a5d, 0x0a5a, 0x1152b, 0x152a, 0x1694, 0xd6aa, 0x15aa, 0x0ab4, 0x94ba, 0x14b6, 0x0a56, 0x7527, 0x0d26, 0xee53, 0x0d54, 0x15aa, 0xa9b5, 0x096c, 0x14ae, 0x8a4e, 0x1a4c, 0x11d26, 0x1aa4, 0x1b54, 0xcd6a, 0x0ada, 0x095c, 0x949d, 0x149a, 0x1a2a, 0x5b25};
private static int[] solar_1_1 = {1900, 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};
private static int[] solarMonth1 = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
private static int[] solarMonth2 = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
public static int GetBitInt(int data, int length, int shift)
{
return (data & (((1 << length) - 1) << shift)) >> shift;
}
//WARNING: Dates before Oct. 1582 are inaccurate
public 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);
}
public 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;
}
private static bool IsLeapYear(int y)
{
return ((y % 4 == 0 && y % 100 != 0) || (y % 400 == 0));
}
public static Solar LunarToSolar(Lunar lunar)
{
Solar solar = new Solar();
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);
}
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;
}
}