最近一直在做关于日历的开发，对于国内来说，农历和二十四节气是必不可少的。奈何网上的各种资料都不能满足需求，或者多多少少都有点问题，动手查阅各种资料自己实现了一个公历和农历互相转换的工具类。

1 /**  2  * 工具类，实现公农历互转  3  */  4 public class LunarCalendar {  5           6         /**  7          * 支持转换的最小农历年份  8          */  9         public static final int MIN_YEAR = 1900; 10         /** 11          * 支持转换的最大农历年份 12          */ 13         public static final int MAX_YEAR = 2099; 14  15         /** 16          * 公历每月前的天数 17          */ 18         private static final int DAYS_BEFORE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181, 19                         212, 243, 273, 304, 334, 365 }; 20          21         /** 22          * 用来表示1900年到2099年间农历年份的相关信息，共24位bit的16进制表示，其中： 23          * 1. 前4位表示该年闰哪个月； 24          * 2. 5-17位表示农历年份13个月的大小月分布，0表示小，1表示大； 25          * 3. 最后7位表示农历年首（正月初一）对应的公历日期。 26          *  27          * 以2014年的数据0x955ABF为例说明： 28          *                 1001 0101 0101 1010 1011 1111 29          *                 闰九月                                  农历正月初一对应公历1月31号         30          */ 31         private static final int LUNAR_INFO[] = { 32                 0x84B6BF,/*1900*/ 33               0x04AE53,0x0A5748,0x5526BD,0x0D2650,0x0D9544,0x46AAB9,0x056A4D,0x09AD42,0x24AEB6,0x04AE4A,/*1901-1910*/ 34             0x6A4DBE,0x0A4D52,0x0D2546,0x5D52BA,0x0B544E,0x0D6A43,0x296D37,0x095B4B,0x749BC1,0x049754,/*1911-1920*/ 35             0x0A4B48,0x5B25BC,0x06A550,0x06D445,0x4ADAB8,0x02B64D,0x095742,0x2497B7,0x04974A,0x664B3E,/*1921-1930*/ 36             0x0D4A51,0x0EA546,0x56D4BA,0x05AD4E,0x02B644,0x393738,0x092E4B,0x7C96BF,0x0C9553,0x0D4A48,/*1931-1940*/ 37             0x6DA53B,0x0B554F,0x056A45,0x4AADB9,0x025D4D,0x092D42,0x2C95B6,0x0A954A,0x7B4ABD,0x06CA51,/*1941-1950*/ 38             0x0B5546,0x555ABB,0x04DA4E,0x0A5B43,0x352BB8,0x052B4C,0x8A953F,0x0E9552,0x06AA48,0x6AD53C,/*1951-1960*/ 39             0x0AB54F,0x04B645,0x4A5739,0x0A574D,0x052642,0x3E9335,0x0D9549,0x75AABE,0x056A51,0x096D46,/*1961-1970*/ 40             0x54AEBB,0x04AD4F,0x0A4D43,0x4D26B7,0x0D254B,0x8D52BF,0x0B5452,0x0B6A47,0x696D3C,0x095B50,/*1971-1980*/ 41             0x049B45,0x4A4BB9,0x0A4B4D,0xAB25C2,0x06A554,0x06D449,0x6ADA3D,0x0AB651,0x095746,0x5497BB,/*1981-1990*/ 42             0x04974F,0x064B44,0x36A537,0x0EA54A,0x86B2BF,0x05AC53,0x0AB647,0x5936BC,0x092E50,0x0C9645,/*1991-2000*/ 43             0x4D4AB8,0x0D4A4C,0x0DA541,0x25AAB6,0x056A49,0x7AADBD,0x025D52,0x092D47,0x5C95BA,0x0A954E,/*2001-2010*/ 44             0x0B4A43,0x4B5537,0x0AD54A,0x955ABF,0x04BA53,0x0A5B48,0x652BBC,0x052B50,0x0A9345,0x474AB9,/*2011-2020*/ 45             0x06AA4C,0x0AD541,0x24DAB6,0x04B64A,0x6a573D,0x0A4E51,0x0D2646,0x5E933A,0x0D534D,0x05AA43,/*2021-2030*/ 46             0x36B537,0x096D4B,0xB4AEBF,0x04AD53,0x0A4D48,0x6D25BC,0x0D254F,0x0D5244,0x5DAA38,0x0B5A4C,/*2031-2040*/ 47             0x056D41,0x24ADB6,0x049B4A,0x7A4BBE,0x0A4B51,0x0AA546,0x5B52BA,0x06D24E,0x0ADA42,0x355B37,/*2041-2050*/ 48             0x09374B,0x8497C1,0x049753,0x064B48,0x66A53C,0x0EA54F,0x06AA44,0x4AB638,0x0AAE4C,0x092E42,/*2051-2060*/ 49             0x3C9735,0x0C9649,0x7D4ABD,0x0D4A51,0x0DA545,0x55AABA,0x056A4E,0x0A6D43,0x452EB7,0x052D4B,/*2061-2070*/ 50             0x8A95BF,0x0A9553,0x0B4A47,0x6B553B,0x0AD54F,0x055A45,0x4A5D38,0x0A5B4C,0x052B42,0x3A93B6,/*2071-2080*/ 51             0x069349,0x7729BD,0x06AA51,0x0AD546,0x54DABA,0x04B64E,0x0A5743,0x452738,0x0D264A,0x8E933E,/*2081-2090*/ 52             0x0D5252,0x0DAA47,0x66B53B,0x056D4F,0x04AE45,0x4A4EB9,0x0A4D4C,0x0D1541,0x2D92B5          /*2091-2099*/ 53     }; 54          55         /** 56          * 将农历日期转换为公历日期 57          * @param year                        农历年份 58          * @param month                        农历月 59          * @param monthDay                农历日 60          * @param isLeapMonth        该月是否是闰月 61          * [url=home.php?mod=space&uid=7300]@return[/url] 返回农历日期对应的公历日期，year0, month1, day2. 62          */ 63         public static final int[] lunarToSolar(int year, int month, int monthDay, 64                         boolean isLeapMonth) { 65                 int dayOffset; 66                 int leapMonth; 67                 int i; 68                  69                 if (year < MIN_YEAR || year > MAX_YEAR || month < 1 || month > 12 70                                 || monthDay < 1 || monthDay > 30) { 71                         throw new IllegalArgumentException( 72                                         "Illegal lunar date, must be like that:\n\t" + 73                                         "year : 1900~2099\n\t" +  74                                         "month : 1~12\n\t" + 75                                         "day : 1~30"); 76                 } 77                  78                 dayOffset = (LUNAR_INFO[year - MIN_YEAR] & 0x001F) - 1; 79  80                 if (((LUNAR_INFO[year - MIN_YEAR] & 0x0060) >> 5) == 2) 81                         dayOffset += 31; 82  83                 for (i = 1; i < month; i++) { 84                         if ((LUNAR_INFO[year - MIN_YEAR] & (0x80000 >> (i - 1))) == 0) 85                                 dayOffset += 29; 86                         else 87                                 dayOffset += 30; 88                 } 89  90                 dayOffset += monthDay; 91                 leapMonth = (LUNAR_INFO[year - MIN_YEAR] & 0xf00000) >> 20; 92  93                 // 这一年有闰月 94                 if (leapMonth != 0) { 95                         if (month > leapMonth || (month == leapMonth && isLeapMonth)) { 96                                 if ((LUNAR_INFO[year - MIN_YEAR] & (0x80000 >> (month - 1))) == 0) 97                                         dayOffset += 29; 98                                 else 99                                         dayOffset += 30;100                         }101                 }102 103                 if (dayOffset > 366 || (year % 4 != 0 && dayOffset > 365)) {104                         year += 1;105                         if (year % 4 == 1)106                                 dayOffset -= 366;107                         else108                                 dayOffset -= 365;109                 }110                 111                 int[] solarInfo = new int[3];112                 for (i = 1; i < 13; i++) {113                         int iPos = DAYS_BEFORE_MONTH[i];114                         if (year % 4 == 0 && i > 2) {115                                 iPos += 1;116                         }117 118                         if (year % 4 == 0 && i == 2 && iPos + 1 == dayOffset) {119                                 solarInfo[1] = i;120                                 solarInfo[2] = dayOffset - 31;121                                 break;122                         }123 124                         if (iPos >= dayOffset) {125                                 solarInfo[1] = i;126                                 iPos = DAYS_BEFORE_MONTH[i - 1];127                                 if (year % 4 == 0 && i > 2) {128                                         iPos += 1;129                                 }130                                 if (dayOffset > iPos)131                                         solarInfo[2] = dayOffset - iPos;132                                 else if (dayOffset == iPos) {133                                         if (year % 4 == 0 && i == 2)134                                                 solarInfo[2] = DAYS_BEFORE_MONTH[i] - DAYS_BEFORE_MONTH[i - 1] + 1;135                                         else136                                                 solarInfo[2] = DAYS_BEFORE_MONTH[i] - DAYS_BEFORE_MONTH[i - 1];137 138                                 } else139                                         solarInfo[2] = dayOffset;140                                 break;141                         }142                 }143                 solarInfo[0] = year;144 145                 return solarInfo;146         }147         148         /**149          * 将公历日期转换为农历日期，且标识是否是闰月150          * @param year151          * @param month152          * @param monthDay153          * @return 返回公历日期对应的农历日期，year0，month1，day2，leap3154          */155         public static final int[] solarToLunar(int year, int month, int monthDay) {156                 int[] lunarDate = new int[4];157                 Date baseDate = new GregorianCalendar(1900, 0, 31).getTime();158                 Date objDate = new GregorianCalendar(year, month - 1, monthDay).getTime();159                 int offset = (int) ((objDate.getTime() - baseDate.getTime()) / 86400000L);160                 161                 // 用offset减去每农历年的天数计算当天是农历第几天162         // iYear最终结果是农历的年份, offset是当年的第几天163                 int iYear, daysOfYear = 0;164                 for (iYear = MIN_YEAR; iYear <= MAX_YEAR && offset > 0; iYear++) {165                         daysOfYear = daysInLunarYear(iYear);166                         offset -= daysOfYear;167                 }168                 if (offset < 0) {169                         offset += daysOfYear;170                         iYear--;171                 }172                 173                 // 农历年份174                 lunarDate[0] = iYear;175                 176                 int leapMonth = leapMonth(iYear); // 闰哪个月,1-12177                 boolean isLeap = false;178                 // 用当年的天数offset,逐个减去每月（农历）的天数，求出当天是本月的第几天179         int iMonth, daysOfMonth = 0;180                 for (iMonth = 1; iMonth <= 13 && offset > 0; iMonth++) {181                         daysOfMonth = daysInLunarMonth(iYear, iMonth);182                         offset -= daysOfMonth;183                 }184                 // 当前月超过闰月，要校正185         if (leapMonth != 0 && iMonth > leapMonth) {186                 --iMonth;187                 188                 if (iMonth == leapMonth) {189                         isLeap = true;190                 }191         }192         // offset小于0时，也要校正193         if (offset < 0) {194             offset += daysOfMonth;195             --iMonth;196         }197         198         lunarDate[1] = iMonth;199         lunarDate[2] = offset + 1;200         lunarDate[3] = isLeap ? 1 : 0;201                 202                 return lunarDate;203         }204         205         /**206          * 传回农历year年month月的总天数207          * @param year 要计算的年份208          * @param month        要计算的月209          * @return 传回天数210          */211         final public static int daysInMonth(int year, int month) {212                 return daysInMonth(year, month, false);213         }214         215         /**216          * 传回农历year年month月的总天数217          * @param year 要计算的年份218          * @param month        要计算的月219          * @param leap 当月是否是闰月220          * @return 传回天数，如果闰月是错误的，返回0.221          */222         public static final int daysInMonth(int year, int month, boolean leap) {223                 int leapMonth = leapMonth(year);224                 int offset = 0;225                 226                 // 如果本年有闰月且month大于闰月时，需要校正227                 if (leapMonth != 0 && month > leapMonth) {228                         offset = 1;229                 }230                 231                 // 不考虑闰月232                 if (!leap) {233                         return daysInLunarMonth(year, month + offset);234                 } else {235                         // 传入的闰月是正确的月份236                         if (leapMonth != 0 && leapMonth == month) {237                                 return daysInLunarMonth(year, month + 1);238                         }239                 }240                 241                 return 0;242         }243         244         /**245      * 传回农历 year年的总天数246      *247      * @param year 将要计算的年份248      * @return 返回传入年份的总天数249      */250     private static int daysInLunarYear(int year) {251         int i, sum = 348;252         if (leapMonth(year) != 0) {253                 sum = 377;254         }255         int monthInfo = LUNAR_INFO[year - MIN_YEAR] & 0x0FFF80;256         for (i = 0x80000; i > 0x7; i >>= 1) {257             if ((monthInfo & i) != 0)258                 sum += 1;259         }260         return sum;261     }262     263     /**264      * 传回农历 year年month月的总天数，总共有13个月包括闰月265      *266      * @param year  将要计算的年份267      * @param month 将要计算的月份268      * @return 传回农历 year年month月的总天数269      */270     private static int daysInLunarMonth(int year, int month) {271         if ((LUNAR_INFO[year - MIN_YEAR] & (0x100000 >> month)) == 0)272             return 29;273         else274             return 30;275     }276         277         /**278          * 传回农历 year年闰哪个月 1-12 , 没闰传回 0279          * 280          * @param year 将要计算的年份281          * @return 传回农历 year年闰哪个月1-12, 没闰传回 0282          */283         private static int leapMonth(int year) {284                 return (int) ((LUNAR_INFO[year - MIN_YEAR] & 0xF00000)) >> 20;285         }286         287 }

以上工具类支持农历1900年正月初一到2099年腊月三十之间的农历日期。需要的拿走吧！下期附上二十四节气计算的工具类。