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计算公历日对应的农历日期的方法：先计算出公历日离当年元旦的天数，然后查表取得当年的春节日期，计算出春节离元旦的天数，二者相减即可算出公历日离春节的天数。以后只要根据大小月和闰月信息，减一月天数调整一月农历月份，即可推算出公历日所对应的农历日期。如公历日不到春节日期，农历年要比公历年小一年，农历大小月取前一年的信息。农历月从12月向前推算。
本程序，对应公历年的范围为1901年到2099年。
/***************************************************************/
/*1.c公历转农历程序*/
/***************************************************************/
#include<time.h>
#include<stdio.h>
#include<string.h>
unsigned int LunarCalendarDay;
unsigned int LunarCalendarTable[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,0x0E9552,0x06AA48,0x6AD53C,/*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*/
};
int MonthAdd[12]={0,31,59,90,120,151,181,212,243,273,304,334};
int LunarCalendar(int year,int month,int day)
{
int Spring_NY,Sun_NY,StaticDayCount;
int index,flag;
//Spring_NY记录春节离当年元旦的天数。
//Sun_NY记录公历日离当年元旦的天数。
if(((LunarCalendarTable[year-1901]&0x0060)<5)==1)
Spring_NY=(LunarCalendarTable[year-1901]&0x001F)-1;
else
Spring_NY=(LunarCalendarTable[year-1901]&0x001F)-1+31;
Sun_NY=MonthAdd[month-1]+day-1;
if((!(year%4))&&(month>2))
Sun_NY++;
//StaticDayCount记录大小月的天数29或30
//index记录从哪个月开始来计算。
//flag是用来对闰月的特殊处理。
//判断公历日在春节前还是春节后
if(Sun_NY>=Spring_NY)
//公历日在春节后(含春节那天)
{
Sun_NY-=Spring_NY;
month=1;
index=1;
flag=0;
if((LunarCalendarTable[year-1901]&(0x80000»(index-1)))==0)
StaticDayCount=29;
else
StaticDayCount=30;
while(Sun_NY>=StaticDayCount)
{
Sun_NY-=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_NY+1;
}
else
//公历日在春节前
{
Spring_NY-=Sun_NY;
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_NY>StaticDayCount)
{
Spring_NY-=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_NY+1;
}
LunarCalendarDay|=day;
LunarCalendarDay|=(month«6);
if(month==((LunarCalendarTable[year-1901]&0xF00000)»20))
return 1;
else
return 0;
}
main()
{
const char*ChDay[]={"*","初一","初二","初三","初四","初五",
"初六","初七","初八","初九","初十",
"十一","十二","十三","十四","十五",
"十六","十七","十八","十九","二十",
"廿一","廿二","廿三","廿四","廿五",
"廿六","廿七","廿八","廿九","三十"
};
const char*ChMonth[]={"*","正","二","三","四","五","六","七","八","九","十","十一","腊"};
struct tm*Local;
long t;
int year,month,day;
char str[13]="";
#if0
t=time(NULL);
Local=localtime(&t);
year=Local-<tm_year+1900;
month=Local->tm_mon+1;
day=Local->tm_mday;
#else
printf("请依次输入公历的年月日(例如2016年5月7日,输入:2016-5-7)");
scanf("%d-%d-%d",&year,&month,&day);
#endif
printf("%d年%d月%d日\t",year,month,day);
if(LunarCalendar(year,month,day))
{
strcat(str,"闰");
strcat(str,ChMonth[(LunarCalendarDay&0x3C0)»6]);
}
else
strcat(str,ChMonth[(LunarCalendarDay&0x3C0)»6]);
strcat(str,"月");
strcat(str,ChDay[LunarCalendarDay&0x3F]);
puts(str);
getchar();
}
【例1.7】公历转农历程序。
解：打开“公历转农历程序”文件夹，双击扩展名为DSW的文件，进入Visual C++ 6.0编译环境，将程序编译并执行之，根据屏幕提示，输入公历年月日，运行结果如下：
由运行结果可见，当公历输入2016年5月23日时，对应的农历为“四月十七”。