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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 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 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 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。
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