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//file: lunarday.cpp
//author: cuichao@gmail.com
//2007-02-13 11:22:48
#include "lunarday.h"
#include <ctime>
#include <cassert>
#include <cstring>
#include <iostream>
using namespace std;
using lunar::Date;
//使用比特位记录每年的情况
//0~4 共5bit 春节日份
//5~6 共2bit 春节月份
//7~19 共13bit 13个月的大小月情况(如果无闰月，最后位无效)，大月为1,小月为0
//20~23 共4bit 记录闰月的月份，如果没有闰月为0
static const int BEGIN_YEAR = 1901;
static const int NUMBER_YEAR = 199;
static const unsigned int LUNAR_YEARS[199] = {
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,0x0E9552,0x06AA48,0x7AD53C, //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
};
//计算这个公历日期是一年中的第几天
static int DayOfSolarYear(int year, int month, int day )
{
//为了提高效率，记录每月一日是一年中的第几天
static const int NORMAL_YDAY[12] = {1,32,60,91,121,152,
182,213,244,274,305,335};
//闰年的情况
static const int LEAP_YDAY[12] = {1,32,61,92,122,153,
183,214,245,275,306,336};
const int *t_year_yday_ = NORMAL_YDAY;
//判断是否是公历闰年
if( year % 4 ==0 )
{
if(year%100 != 0)
t_year_yday_ = LEAP_YDAY;
if(year%400 == 0)
t_year_yday_ = LEAP_YDAY;
}
return t_year_yday_[month -1] + (day -1);
}
Date lunar::LuanrDate(int solar_year,int solar_month,int solar_day)
{
Date luanr_date ;
luanr_date.year = solar_year;
luanr_date.month = 0;
luanr_date.day = 0;
luanr_date.leap = false;
//越界检查，如果越界，返回无效日期
if(solar_year <= BEGIN_YEAR || solar_year > BEGIN_YEAR + NUMBER_YEAR - 1 )
return luanr_date;
int year_index = solar_year - BEGIN_YEAR;
//计算春节的公历日期
int spring_ny_month = ( LUNAR_YEARS[year_index] & 0x60 ) >> 5;
int spring_ny_day = ( LUNAR_YEARS[year_index]
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