我是根据网上07年的一个计算公历农历转换代码改的，原代码有如下问题：1、农历不正确。2、除夕农历显示不正确。
农历我是拿手机查询中华万年历进行修改的，修改方法见：https://blog.csdn.net/kim5659/article/details/113809339
除夕农历显示不正确的原因由于懒没去查原代码，就在显示部分进行修正。效果见：https://blog.csdn.net/kim5659/article/details/113828194
现把全部代码放出来，希望能帮助需要的人。其实它修改一下后可以用在所有需要农历显示的地方。现在我修改了2020到2080年的80年数据，原代码中的数据是1901-2099年差不多200年的数据，改倒也不麻烦，就是费时间。修改的方法和文件我都放出来，有兴趣也可以自己改一下。当然我全部改完也会放出来。
注：农历数据是根据中华万年历修改和校对的，修改部分目前没发现错误，但不保证实际使用是否正确，请使用者自行辨别。对于使用者使用本代码产生的任何问题本人不负责任。
懒人可以到我资源里下载。别拿了就走，点个赞留个言啥的再走不迟。
原代码：
//file: chdate.cpp
#include <iostream>
#include <ctime>
#include "lunarday.h"
int main(int argc, char *argv[])
{
using namespace std;
using namespace lunar;
//time_t current_time;
//time(¤t_time);
//tm *current_tm = localtime(¤t_time);
//int year = current_tm->tm_year + 1900;
//int month = current_tm->tm_mon + 1;
//int day = current_tm->tm_mday;
int year=2080;
int month;
int day;
while (true){
cout << "请输入年份：";
cin >> year;
cout << "请输入月份：";
cin >> month;
cout << "请输入日期：";
cin >> day;
Date lunar_date = LuanrDate(year, month, day);
//cout <<"计算的除夕农历月份："<< lunar_date.month << endl;
//cout <<"计算的除夕农历日期："<< lunar_date.day << endl;
if (lunar_date.day == 0) { //判断这天的日期是否为0，错误的农历日期为0.
cout << endl;
//cout << "调整后除夕日期：" << endl;
cout << lunar_date.year << "年";
cout << "12月"; //因为就是除夕不对，所在这天一定是农历12月。
day = day - 1; //日期减一天。
Date lunar_date = LuanrDate(year, month, day);//重新计算前一天的农历，必须重新计算。
cout << lunar_date.day+1 << "日" << endl; //计算前一天农历日期后加1得到正确的除夕农历日期。
}
else { //不是除夕的日期是正确的正常计算。
cout << lunar_date.year << "年";
if (lunar_date.leap)
cout << "闰";
cout << lunar_date.month << "月";
cout << lunar_date.day << "日" << endl;
}
//return 0;
}
}
//file:lunarday.cpp
#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
0x0A4B4C,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,0x052B50,0x0A9345,0x4A9739, //2011-2020
0x02AB4C,0x055AC1,0x2AD936,0x03694A,0x6752BD,
0x0392D1,0x0325C6,0x564BBA,0x0655CD,0x02AD43, //2021-2030
0x356B37,0x05B4CB,0xBBA93F,0x05A953,0x0592C8,//
0x6D25BC,0x0525CF,0x0255C4,0x52ADB8,0x02D6CC, //2031-2040
0x05B541,0x2DA936,0x06C94A,0x7E92BE,0x0692D1,
0x052AC6,0x5A56BA,0x025B4E,0x02DAC2,0x36D537, //2041-2050
0x0764CB,0x8F4941,0x074953,0x069348,0x652B3C,
0x052BCF,0x026B44,0x436AB8,0x03AACC,0x03A4C2, //2051-2060
0x3749B5,0x0349C9,0x7A95BD,0x0295D1,0x052DC5,
0x5AAD3A,0x02B54E,0x05B2C3,0x4BA537,0x05A54B, //2061-2070
0x8D4ABF,0x054AD3,0x0296C7,0x6556BB,0x055ACF,
0x02D545,0x45D2B8,0x06D2CC,0x06A542,0x3E4AB6, //2071-2080//20到8------------------------------------------------------------------------------------------------------------0年数据修改完成，按照中华万年历修改农历月份大小。
//再运行程序对照中华万年历每月校核两个日期，农历正确。2021.2.16
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] & 0x1f);
//计算今天是公历年的第几天
int today_solar_yd = DayOfSolarYear(solar_year, solar_month, solar_day);
//计算春节是公历年的第几天
int spring_ny_yd = DayOfSolarYear(solar_year, spring_ny_month, spring_ny_day);
//计算今天是农历年的第几天
int today_luanr_yd = today_solar_yd - spring_ny_yd + 1;
//如果今天在春节的前面，重新计算today_luanr_yd
if (today_luanr_yd < 0)
{
//农历年比当前公历年小1
year_index--;
luanr_date.year--;
//越界，返回无效日期
if (year_index < 0)
return luanr_date;
spring_ny_month = (LUNAR_YEARS[year_index] & 0x60) >> 5;
spring_ny_day = (LUNAR_YEARS[year_index] & 0x1f);
spring_ny_yd = DayOfSolarYear(solar_year, spring_ny_month, spring_ny_day);
int year_total_day = DayOfSolarYear(luanr_date.year, 12, 31);
today_luanr_yd = today_solar_yd + year_total_day - spring_ny_yd + 1;
}
int luanr_month = 1;
//计算月份和日期
for (; luanr_month <= 13; luanr_month++)
{
int month_day = 29;
if ((LUNAR_YEARS[year_index] >> (6 + luanr_month)) & 0x1)
month_day = 30;
if (today_luanr_yd <= month_day)
break;
else
today_luanr_yd -= month_day;
}
luanr_date.day = today_luanr_yd;
//处理闰月
int leap_month = (LUNAR_YEARS[year_index] >> 20) & 0xf;
if (leap_month > 0 && leap_month < luanr_month)
{
luanr_month--;
//如果当前月为闰月，设置闰月标志
if (luanr_month == leap_month)
luanr_date.leap = true;
}
assert(leap_month <= 12);
luanr_date.month = luanr_month;
return luanr_date;
}//file:lunarday.h
namespace lunar
{
//保存一个农历日期
typedef struct T_Date
{
//年
int year;
//月
int month;
//日
int day;
//是否闰月
bool leap;
} Date;
//公历转农历
Date LuanrDate(int solar_year, int solar_month, int solar_day);
}