公歷農歷互相轉換的Java日歷工具類

pc688 9年前發布 | 7K 次閱讀 Java
/**

工具類，實現公農歷互轉
*/
public class LunarCalendar {

  /**
   * 支持轉換的最小農歷年份
   */
  public static final int MIN_YEAR = 1900;
  /**
   * 支持轉換的最大農歷年份
   */
  public static final int MAX_YEAR = 2099;

  /**
   * 公歷每月前的天數
   */
  private static final int DAYS_BEFORE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181,
                  212, 243, 273, 304, 334, 365 };

  /**
   * 用來表示1900年到2099年間農歷年份的相關信息，共24位bit的16進制表示，其中：
   * 1. 前4位表示該年閏哪個月；
   * 2. 5-17位表示農歷年份13個月的大小月分布，0表示小，1表示大；
   * 3. 最后7位表示農歷年首（正月初一）對應的公歷日期。
   *
   * 以2014年的數據0x955ABF為例說明：
   *                 1001 0101 0101 1010 1011 1111
   *                 閏九月                                  農歷正月初一對應公歷1月31號       
   */
  private static final int LUNAR_INFO[] = {
          0x84B6BF,/*1900*/
        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,0x0AB651,0x095746,0x5497BB,/*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,0x6a573D,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,0x06AA44,0x4AB638,0x0AAE4C,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*/

};

  /**
   * 將農歷日期轉換為公歷日期
   * @param year                        農歷年份
   * @param month                        農歷月
   * @param monthDay                農歷日
   * @param isLeapMonth        該月是否是閏月
   * [url=home.php?mod=space&uid=7300]@return[/url] 返回農歷日期對應的公歷日期，year0, month1, day2.
   */
  public static final int[] lunarToSolar(int year, int month, int monthDay,
                  boolean isLeapMonth) {
          int dayOffset;
          int leapMonth;
          int i;

          if (year < MIN_YEAR || year > MAX_YEAR || month < 1 || month > 12
                          || monthDay < 1 || monthDay > 30) {
                  throw new IllegalArgumentException(
                                  "Illegal lunar date, must be like that:\n\t" +
                                  "year : 1900~2099\n\t" +
                                  "month : 1~12\n\t" +
                                  "day : 1~30");
          }

          dayOffset = (LUNAR_INFO[year - MIN_YEAR] & 0x001F) - 1;

          if (((LUNAR_INFO[year - MIN_YEAR] & 0x0060) >> 5) == 2)
                  dayOffset += 31;

          for (i = 1; i < month; i++) {
                  if ((LUNAR_INFO[year - MIN_YEAR] & (0x80000 >> (i - 1))) == 0)
                          dayOffset += 29;
                  else
                          dayOffset += 30;
          }

          dayOffset += monthDay;
          leapMonth = (LUNAR_INFO[year - MIN_YEAR] & 0xf00000) >> 20;

          // 這一年有閏月
          if (leapMonth != 0) {
                  if (month > leapMonth || (month == leapMonth && isLeapMonth)) {
                          if ((LUNAR_INFO[year - MIN_YEAR] & (0x80000 >> (month - 1))) == 0)
                                  dayOffset += 29;
                          else
                                  dayOffset += 30;
                  }
          }

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

          int[] solarInfo = new int[3];
          for (i = 1; i < 13; i++) {
                  int iPos = DAYS_BEFORE_MONTH[i];
                  if (year % 4 == 0 && i > 2) {
                          iPos += 1;
                  }

                  if (year % 4 == 0 && i == 2 && iPos + 1 == dayOffset) {
                          solarInfo[1] = i;
                          solarInfo[2] = dayOffset - 31;
                          break;
                  }

                  if (iPos >= dayOffset) {
                          solarInfo[1] = i;
                          iPos = DAYS_BEFORE_MONTH[i - 1];
                          if (year % 4 == 0 && i > 2) {
                                  iPos += 1;
                          }
                          if (dayOffset > iPos)
                                  solarInfo[2] = dayOffset - iPos;
                          else if (dayOffset == iPos) {
                                  if (year % 4 == 0 && i == 2)
                                          solarInfo[2] = DAYS_BEFORE_MONTH[i] - DAYS_BEFORE_MONTH[i - 1] + 1;
                                  else
                                          solarInfo[2] = DAYS_BEFORE_MONTH[i] - DAYS_BEFORE_MONTH[i - 1];

                          } else
                                  solarInfo[2] = dayOffset;
                          break;
                  }
          }
          solarInfo[0] = year;

          return solarInfo;
  }

  /**
   * 將公歷日期轉換為農歷日期，且標識是否是閏月
   * @param year
   * @param month
   * @param monthDay
   * @return 返回公歷日期對應的農歷日期，year0，month1，day2，leap3
   */
  public static final int[] solarToLunar(int year, int month, int monthDay) {
          int[] lunarDate = new int[4];
          Date baseDate = new GregorianCalendar(1900, 0, 31).getTime();
          Date objDate = new GregorianCalendar(year, month - 1, monthDay).getTime();
          int offset = (int) ((objDate.getTime() - baseDate.getTime()) / 86400000L);

          // 用offset減去每農歷年的天數計算當天是農歷第幾天
  // iYear最終結果是農歷的年份, offset是當年的第幾天
          int iYear, daysOfYear = 0;
          for (iYear = MIN_YEAR; iYear <= MAX_YEAR && offset > 0; iYear++) {
                  daysOfYear = daysInLunarYear(iYear);
                  offset -= daysOfYear;
          }
          if (offset < 0) {
                  offset += daysOfYear;
                  iYear--;
          }

          // 農歷年份
          lunarDate[0] = iYear;

          int leapMonth = leapMonth(iYear); // 閏哪個月,1-12
          boolean isLeap = false;
          // 用當年的天數offset,逐個減去每月（農歷）的天數，求出當天是本月的第幾天
  int iMonth, daysOfMonth = 0;
          for (iMonth = 1; iMonth <= 13 && offset > 0; iMonth++) {
                  daysOfMonth = daysInLunarMonth(iYear, iMonth);
                  offset -= daysOfMonth;
          }
          // 當前月超過閏月，要校正
  if (leapMonth != 0 && iMonth > leapMonth) {
          --iMonth;

          if (iMonth == leapMonth) {
                  isLeap = true;
          }
  }
  // offset小于0時，也要校正
  if (offset < 0) {
      offset += daysOfMonth;
      --iMonth;
  }

  lunarDate[1] = iMonth;
  lunarDate[2] = offset + 1;
  lunarDate[3] = isLeap ? 1 : 0;

          return lunarDate;
  }

  /**
   * 傳回農歷year年month月的總天數
   * @param year 要計算的年份
   * @param month        要計算的月
   * @return 傳回天數
   */
  final public static int daysInMonth(int year, int month) {
          return daysInMonth(year, month, false);
  }

  /**
   * 傳回農歷year年month月的總天數
   * @param year 要計算的年份
   * @param month        要計算的月
   * @param leap 當月是否是閏月
   * @return 傳回天數，如果閏月是錯誤的，返回0.
   */
  public static final int daysInMonth(int year, int month, boolean leap) {
          int leapMonth = leapMonth(year);
          int offset = 0;

          // 如果本年有閏月且month大于閏月時，需要校正
          if (leapMonth != 0 && month > leapMonth) {
                  offset = 1;
          }

          // 不考慮閏月
          if (!leap) {
                  return daysInLunarMonth(year, month + offset);
          } else {
                  // 傳入的閏月是正確的月份
                  if (leapMonth != 0 && leapMonth == month) {
                          return daysInLunarMonth(year, month + 1);
                  }
          }

          return 0;
  }

  /**


傳回農歷 year年的總天數
*
@param year 將要計算的年份
@return 返回傳入年份的總天數
*/
private static int daysInLunarYear(int year) {
 int i, sum = 348;
 if (leapMonth(year) != 0) {

     sum = 377;

}
 int monthInfo = LUNAR_INFO[year - MIN_YEAR] & 0x0FFF80;
 for (i = 0x80000; i > 0x7; i >>= 1) {

 if ((monthInfo & i) != 0)
     sum += 1;

}
 return sum;
}
/**

傳回農歷 year年month月的總天數，總共有13個月包括閏月
*
@param year  將要計算的年份
@param month 將要計算的月份
@return 傳回農歷 year年month月的總天數
*/
private static int daysInLunarMonth(int year, int month) {
 if ((LUNAR_INFO[year - MIN_YEAR] & (0x100000 >> month)) == 0)

 return 29;

else

 return 30;

}
/**

傳回農歷 year年閏哪個月 1-12 , 沒閏傳回 0
*
@param year 將要計算的年份
@return 傳回農歷 year年閏哪個月1-12, 沒閏傳回 0
*/
private static int leapMonth(int year) {
 return (int) ((LUNAR_INFO[year - MIN_YEAR] & 0xF00000)) >> 20;

}





}</pre> 

 以上工具類支持農歷1900年正月初一到2099年臘月三十之間的農歷日期。

 

 來自：http://www.eoeandroid.com/thread-327298-1-1.html
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公歷農歷互相轉換的Java日歷工具類

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