iOS - 获取系统时间年月日,阳历(公历)日期转农历的方法

//获取当前时间
    NSDate *now = [NSDate date];
    NSLog(@" now date is: %@ ",now);
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
    NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:now];
    
    int year = [dateComponent year];
    int month = [dateComponent month];
    int day = [dateComponent day];
    int hour = [dateComponent hour];
    int minute = [dateComponent minute];
    int second = [dateComponent second];
    
    NSLog(@" year is: %d ",year);
    NSLog(@" month is: %d ",month);
    NSLog(@" day is: %d ",day);
    NSLog(@" hour is: %d ",hour);
    NSLog(@" minute is: %d ",minute);
    NSLog(@" second is: %d ",second);

NSString *dateTime = [self LunarForSolarYear:year Month:month Day:day];

//农历转换函数
- (NSString *)LunarForSolarYear:(int)wCurYear Month:(int)wCurMonth Day:(NSInteger)wCurDay {
    //农历日期名
    NSArray *cDayName =  [NSArray arrayWithObjects:@"*",@"初一",@"初二",@"初三",@"初四",@"初五",@"初六",@"初七",@"初八",@"初九",@"初十",
                          
                          @"十一",@"十二",@"十三",@"十四",@"十五",@"十六",@"十七",@"十八",@"十九",@"二十",
                          
                          @"廿一",@"廿二",@"廿三",@"廿四",@"廿五",@"廿六",@"廿七",@"廿八",@"廿九",@"三十",nil];
    //农历月份名
    NSArray *cMonName =  [NSArray arrayWithObjects:@"*",@"正",@"二",@"三",@"四",@"五",@"六",@"七",@"八",@"九",@"十",@"十一",@"腊",nil];
    //公历每月前面的天数
    const int wMonthAdd[12] = {0,31,59,90,120,151,181,212,243,273,304,334};
    //农历数据
    const int wNongliData[100] = {2635,333387,1701,1748,267701,694,2391,133423,1175,396438
        
        ,3402,3749,331177,1453,694,201326,2350,465197,3221,3402
        
        ,400202,2901,1386,267611,605,2349,137515,2709,464533,1738
        
        ,2901,330421,1242,2651,199255,1323,529706,3733,1706,398762
        
        ,2741,1206,267438,2647,1318,204070,3477,461653,1386,2413
        
        ,330077,1197,2637,268877,3365,531109,2900,2922,398042,2395
        
        ,1179,267415,2635,661067,1701,1748,398772,2742,2391,330031
        
        ,1175,1611,200010,3749,527717,1452,2742,332397,2350,3222
        
        ,268949,3402,3493,133973,1386,464219,605,2349,334123,2709
        
        ,2890,267946,2773,592565,1210,2651,395863,1323,2707,265877};
    
    static int nTheDate,nIsEnd,m,k,n,i,nBit;
    //计算到初始时间1921年2月8日的天数：1921-2-8(正月初一)
    nTheDate = (wCurYear - 1921) * 365 + (wCurYear - 1921) / 4 + wCurDay + wMonthAdd[wCurMonth - 1] - 38;
    
    if((!(wCurYear % 4)) && (wCurMonth > 2))
        nTheDate = nTheDate + 1;
    
    //计算农历天干、地支、月、日
    nIsEnd = 0;
    m = 0;
    
    while(nIsEnd != 1) {
        if(wNongliData[m] < 4095)
            k = 11;
        else
            k = 12;
        n = k;
        while(n>=0) {
            //获取wNongliData(m)的第n个二进制位的值
            nBit = wNongliData[m];
            for(i=1;i< n+1;i++)
                nBit = nBit/2;
                nBit = nBit % 2;
            if (nTheDate <= (29 + nBit)) {
                nIsEnd = 1;
                break;
            }
            nTheDate = nTheDate - 29 - nBit;
            n = n - 1;
        }
        if(nIsEnd)
            break;
        m = m + 1;
    }
    
    wCurYear = 1921 + m;
    wCurMonth = k - n + 1;
    wCurDay = nTheDate;
    
    if (k == 12) {
        if (wCurMonth == wNongliData[m] / 65536 + 1)
            wCurMonth = 1 - wCurMonth;
        else if (wCurMonth > wNongliData[m] / 65536 + 1)
            wCurMonth = wCurMonth - 1;
    }
    //生成农历月
    NSString *szNongliMonth;
    if (wCurMonth < 1){
        szNongliMonth = [NSString stringWithFormat:@"闰%@",(NSString *)[cMonName objectAtIndex:-1 * wCurMonth]];
    }else{
        szNongliMonth = (NSString *)[cMonName objectAtIndex:wCurMonth];
    }
    //生成农历日
    NSString *szNongliDay = [cDayName objectAtIndex:wCurDay];
    //合并
    NSString *lunarDate = [NSString stringWithFormat:@"农历%@月%@",szNongliMonth,szNongliDay];
    return lunarDate;
}