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: " + 73 "year : 1900~2099 " + 74 "month : 1~12 " + 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 else 108 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 else 136 solarInfo[2] = DAYS_BEFORE_MONTH[i] - DAYS_BEFORE_MONTH[i - 1]; 137 138 } else 139 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 year 151 * @param month 152 * @param monthDay 153 * @return 返回公历日期对应的农历日期，year0，month1，day2，leap3 154 */ 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,1-12 177 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 else 274 return 30; 275 } 276 277 /** 278 * 传回农历 year年闰哪个月 1-12 , 没闰传回 0 279 * 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 0 282 */ 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。