农历 阴历 转换阳历算法

声明：代码来源于网络，只是改的易于阅读与理解而已

#include 
#include 

typedef struct _lunar{
    int year;
    int month;
    int day;
    int is_leap;
} lunar_t;
/*
  bit23 bit22 bit21 bit20:表示当年闰月月份，值为0 为则表示当年无闰月

  bit19 bit18 bit17 bit16 bit15 bit14 bit13 bit12 bit11 bit10 bit9 bit8 bit7
    1     2     3     4     5     6     7     8     9     10    11   12   13
  农历1-13 月大小 。月份对应位为1，农历月大(30 天),为0 表示小(29 天)

  bit6 bit5 bit4 bit3 bit2 bit1 bit0
  春节的公历月份      春节的公历日期
*/
unsigned int lunar200y[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 is_gregorian_leap(int year)
{
	return(  ( ((year % 4) == 0)&&((year % 100) !=0) ) || ( (year % 400) ==0)  );
}

#define MIN_YEAR 1901
#define MAX_YEAR 2099

//0x04AE53
//
//0000 0100 1010 1110 0  101 0011
int lunarLeapMonth(int y)
{
	return((lunar200y[y-MIN_YEAR] & 0xf00000) >>20);
}

int lunarMonthDays(int y, int m)
{
	return( (lunar200y[y-MIN_YEAR] & (0x80000>>(m-1)))? 30: 29 );
}

int lunarLeapMonthDays(int y)
{
	if(lunarLeapMonth(y))
	{
		return( (lunar200y[y-MIN_YEAR] & (0x80000>>(lunarLeapMonth(y)-1)))? 30: 29 );
	}
	else
	{
		return 0;
	}
}

int lunarSpringDate(int y, int*solar_m, int* solar_d)
{
	if(!solar_m||!solar_d)
		return -1;
	*solar_m =(lunar200y[y-MIN_YEAR] & 0x0060) >> 5;
	*solar_d = lunar200y[y-MIN_YEAR]&0x1f;
	return 0;
}

int lunarDateCheck(lunar_t lunar)
{
	int leap = 0;

	if ((lunar.year < MIN_YEAR) || (lunar.year > MAX_YEAR))
	{
	    return -1;
	}

	if ((lunar.month < 1) || (lunar.month > 12))
	{
	    return -1;
	}
	
	if ((lunar.day < 1) || (lunar.day > 30)) //中国的月最多30天
	{
	   return -1;
	}

	if(lunarMonthDays(lunar.year,lunar.month) MAX_YEAR))
	{
	    return -1;
	}
	
	if ((month < 1) || (month > 12))
	{
	    return -1;
	}
	if ((day < 1) || (day > 31))
	{
	   return -1;
	}

	if(month ==2)
	{
		if(is_gregorian_leap(year))// 是闰年
		{
			if(day>29)
				return -1;
		}
		else
		{
			if(day>28)
				return -1;
		}
	}

	return 0;
}



int monthTotal[13] = {0,31,59,90,120,151,181,212,243,273,304,334,365};
int toSolar(lunar_t lunar, int* y, int* m, int*d)
{
    int year = lunar.year,
    month = lunar.month,
    day = lunar.day;
    int byNow, xMonth, i;
	int spring_solar_d;
	int spring_solar_m;
	if(lunarDateCheck(lunar) ==-1)
		return -1;
	if(!y||!m||!d)
		return -1;
    
    lunarSpringDate(year,&spring_solar_m,&spring_solar_d);

    byNow = spring_solar_d - 1;
    if( spring_solar_m == 2)
        byNow += 31;
    for(i = 1; i < month; i ++){
		byNow += lunarMonthDays(year,i);
    }

    byNow += day;
    xMonth =lunarLeapMonth(year);
    if(xMonth != 0)	{
        if(month > xMonth   ||(month==xMonth && lunar.is_leap == 1))	{
		byNow += lunarLeapMonthDays(year);
        }
    }

    if(byNow > 366  ||(year%4!=0 && byNow == 365)){
        year += 1;
        if(year%4==0)
            byNow -= 366;
        else
            byNow -= 365;
    }

    for(i=1; i <= 13; i ++){
        if(monthTotal[i] >= byNow){
            month = i;
            break;
        }
    }
    *d = byNow - monthTotal[month-1];
    *m = month;
    *y = year;
    
    return 0;
}

int toLunar(int year, int month, int day , lunar_t * lunar)
{
    int bySpring,bySolar,daysPerMonth;
    int index,flag;
 	int spring_solar_d;
	int spring_solar_m;

	if(!lunar)
		return -1;
	if(solarDateCheck(year,month,day) ==-1)
		return -1;
    
    //bySpring 记录春节离当年元旦的天数。
    //bySolar 记录阳历日离当年元旦的天数。
    lunarSpringDate(year,&spring_solar_m,&spring_solar_d);
    if( spring_solar_m == 1)
        bySpring = spring_solar_d - 1;
    else
        bySpring = spring_solar_d - 1 + 31;
	
    bySolar = monthTotal[month-1] + day - 1;
    if( (!(year % 4)) && (month > 2))
        bySolar++;
    
    //daysPerMonth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。
    
    //判断阳历日在春节前还是春节后
	if (bySolar >= bySpring) /*/阳历日在春节后（含春节那天）*/
	{
		bySolar -= bySpring;
		month = 1;
		flag = 0;
		daysPerMonth =lunarMonthDays(year,month);

		while(bySolar >= daysPerMonth) 
		{
			bySolar -= daysPerMonth;
			if(month == lunarLeapMonth(year) ) 
			{
				flag = ~flag;
				if(flag == 0)
				{
					month++;
				}
				}
				else
				{
					month++;
				}
				daysPerMonth =lunarMonthDays(year,month);
			}
			day = bySolar + 1;
	}
	else 
	{                                                      //阳历日在春节前 
		bySpring -= bySolar;      
		year--;          
		month = 12;   
		if ( lunarLeapMonth(year) == 0)   
			index = 12;     
		else      
			index = 13;       
		flag = 0;      

		daysPerMonth = lunarMonthDays(year, index );

		while(bySpring > daysPerMonth)
		{         
			bySpring -= daysPerMonth;    
			index--;   

			if(flag == 0)       
			month--;         
			if(month == lunarLeapMonth(year)) 
			{
				flag =!flag;
			}
			daysPerMonth = lunarMonthDays(year, index );
		}
		day = daysPerMonth - bySpring + 1;
	}
	lunar->day = day;
	lunar->month = month;
	lunar->year = year;
	if(month == lunarLeapMonth(year))
		lunar->is_leap = 1;
	else
		lunar->is_leap = 0;
	return 0;
}

int main(int argc, char*argv[])
{
    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"};
    int year,month,day;
 #if 0
    lunar_t olunar = {
        .year = 2009,
        .month  = 5,
        .day = 17,
        .is_leap=1, //1表示闰月,0表示平月
    };
#else
    lunar_t olunar = {
        .year = 1985,
        .month  = 1,
        .day = 11,
        .is_leap=0, //1表示闰月,0表示平月
    };
#endif
      lunar_t lunar; 
  
	if(toSolar(olunar, &year,&month,&day)==0)
	{
		printf("Lunar: %d-%s-%s",olunar.year,ChMonth[olunar.month],ChDay[olunar.day]);
		printf(" =>Solar: %d-%d-%d\n",year,month,day);
	}
	if(toLunar(year,month,day, &lunar)==0)
	{
		printf("Solar: %d-%02d-%02d",year,month,day);
		printf(" =>Lunar: %d-%s-%s\n",lunar.year,ChMonth[lunar.month],ChDay[lunar.day]);
	}
    

	printf("%d\r\n",lunarLeapMonth(2015));
	printf("%d\r\n",lunarMonthDays(2015,1));
	printf("%d\r\n",lunarMonthDays(2015,2));
	printf("%d\r\n",lunarMonthDays(2015,3));
	printf("%d\r\n",lunarMonthDays(1015,5));
	lunarSpringDate(2015,&month,&day);
	printf("springDate is %d - %d\r\n",month,day);
	
	
    return 0;
}