一、概述
本次是以java语言开发为例，计算出年月日对应的天干地支。
二、代码
public class MyDate {
/**
* 对于年月日的天干地支
*/
private int year_ganZhi;
private int month_ganZhi;
private int day_ganZhi;
/**
* 关于阴历的相关信息
*/
private static int[] lunar_info = {0x04bd8, 0x04ae0, 0x0a570, 0x054d5,
0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2, 0x04ae0,
0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2,
0x095b0, 0x14977, 0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40,
0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970, 0x06566, 0x0d4a0,
0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7,
0x0c950, 0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4, 0x025d0,
0x092d0, 0x0d2b2, 0x0a950, 0x0b557, 0x06ca0, 0x0b550, 0x15355,
0x04da0, 0x0a5d0, 0x14573, 0x052d0, 0x0a9a8, 0x0e950, 0x06aa0,
0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263,
0x0d950, 0x05b57, 0x056a0, 0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0,
0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0, 0x195a6, 0x095b0,
0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46,
0x0ab60, 0x09570, 0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50,
0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0, 0x0c960, 0x0d954,
0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0,
0x0cab5, 0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0,
0x0a5b0, 0x15176, 0x052b0, 0x0a930, 0x07954, 0x06aa0, 0x0ad50,
0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65, 0x0d530,
0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0, 0x0a4d0, 0x1d0b6,
0x0d250, 0x0d520, 0x0dd45, 0x0b5a0, 0x056d0, 0x055b2, 0x049b0,
0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0};
/**
* 记录天干的信息
*/
private String[] gan_info = {"甲", "乙", "丙", "丁", "戊", "己", "庚", "辛",
"壬", "癸"};
private String[] zhi_info = {"子", "丑", "寅", "卯", "辰", "巳", "午", "未",
"申", "酉", "戌", "亥"};
/**
* 单例模式
*/
private static volatile MyDate instance = null;
private MyDate() {
}
public static MyDate getInstance() {
if (instance == null) {
synchronized (MyDate.class) {
if (instance == null) {
instance = new MyDate();
}
}
}
return instance;
}
/**
* 获取农历某年的总天数
*
* @param year
* @return
*/
private int daysOfYear(int year) {
int sum = 348;
for (int i = 0x8000; i > 0x8; i >>= 1) {
sum += (lunar_info[year - 1900] & i) == 0 ? 0 : 1;
}
//获取闰月的天数
int daysOfLeapMonth;
if ((lunar_info[year - 1900] & 0xf) != 0) {
daysOfLeapMonth = (lunar_info[year - 1900] & 0x10000) == 0 ? 29 : 30;
} else {
daysOfLeapMonth = 0;
}
return sum + daysOfLeapMonth;
}
/**
* 初始化年月日对应的天干地支
* @param year
* @param month
* @param day
*/
public void initGanZhi(int year, int month, int day) {
//获取现在的时间
Calendar calendar_now = Calendar.getInstance();
calendar_now.set(year, month - 1, day);
long date_now = calendar_now.getTime().getTime();
//获取1900-01-31的时间
Calendar calendar_ago = Calendar.getInstance();
calendar_ago.set(1900, 0 ,31);
long date_ago = calendar_ago.getTime().getTime();
//86400000 = 24 * 60 * 60 * 1000
long days_distance = (date_now - date_ago) / 86400000L;
float remainder = (date_now - date_ago) % 86400000L;
//余数大于0算一天
if (remainder > 0) {
days_distance += 1;
}
//都是从甲子开始算起以1900-01-31为起点
//1899-12-21是农历1899年腊月甲子日 40：相差1900-01-31有40天
day_ganZhi = (int)days_distance + 40;
//1898-10-01是农历甲子月 14：相差1900-01-31有14个月
month_ganZhi = 14;
int daysOfYear = 0;
int i;
for (i = 1900; i < 2050 && days_distance > 0; i++) {
daysOfYear = daysOfYear(i);
days_distance -= daysOfYear;
month_ganZhi += 12;
}
if (days_distance < 0) {
days_distance += daysOfYear;
i--;
month_ganZhi -= 12;
}
//农历年份
int myYear = i;
//1864年是甲子年
year_ganZhi = myYear - 1864;
//哪个月是闰月
int leap = lunar_info[myYear - 1900] & 0xf;
boolean isLeap = false;
int daysOfLeapMonth = 0;
for (i = 1; i < 13 && days_distance > 0; i++) {
//闰月
if (leap > 0 && i == (leap + 1) && !isLeap) {
isLeap = true;
if ((lunar_info[myYear - 1900] & 0xf) != 0) {
daysOfLeapMonth = (lunar_info[myYear - 1900] & 0x10000) == 0 ? 29 : 30;
} else {
daysOfLeapMonth = 0;
}
--i;
} else {
daysOfLeapMonth = (lunar_info[myYear - 1900] & (0x10000 >> i)) == 0 ? 29 : 30;
}
//设置非闰月
if (isLeap && i == (leap + 1)) {
isLeap = false;
}
days_distance -= daysOfLeapMonth;
if (!isLeap) {
month_ganZhi++;
}
}
if (days_distance == 0 && leap > 0 && i == leap + 1 && !isLeap) {
--month_ganZhi;
}
if (days_distance < 0) {
--month_ganZhi;
}
}
/**
* 将年月日转化为天干地支的显示方法
* @param index
* @return
*/
private String ganZhi(int index) {
return gan_info[index % 10] + zhi_info[index % 12];
}
/**
* 获取天干地支
* @return
*/
public String getGanZhi() {
return "农历" + ganZhi(year_ganZhi) + "年 " + ganZhi(month_ganZhi) + "月 " + ganZhi(day_ganZhi) + "日";
}
}
三、基本概念
天干地支，源自于中国远古时代对天象的观测。十干日：阏逢、旃蒙、柔兆、强圉、著雍、屠维、上章、重光、玄黓、昭阳。十二支日：困顿、赤奋若、摄提格、单阏、执徐、大荒落、敦牂、协洽、涒滩、作噩、阉茂、大渊献。
简化后的天干地支：“甲、乙、丙、丁、戊、己、庚、辛、壬、癸”称为十天干，“子、丑、寅、卯、辰、巳、午、未、申、酉、戌、亥”称为十二地支。