ios 公历转农历

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由于NSChineseCalendar有些日期显示不正确. 如2012年08月的日期会比正常的农历晚一天.
所以我自己写了个简单的根据NSDate转换农历的算法. 是根据其它的查表法, 翻译过来的. 验证好用.
需要的同学可以直接使用.

LunarCalendar.h

//
// LunarCalendar.h
// Clock
// NSChineseCalendar有bug, 有些日子不准..所以需要自己写
// Created by shunping liu on 12-7-13.
// Copyright (c) 2012年 tencent. All rights reserved.
//

#import

@interface LunarCalendar : NSObject
{
@private
NSInteger lcMonth;
NSInteger lcYear;
NSInteger lcDay;

NSArray *chineseMonths;
NSArray *chineseDays;
BOOL isLeap;
}

@property (nonatomic, assign) NSInteger lcYear;
@property (nonatomic, assign) NSInteger lcMonth;
@property (nonatomic, assign) NSInteger lcDay;

@property (nonatomic, retain) NSArray *chineseMonths;
@property (nonatomic, retain) NSArray *chineseDays;

- (NSString*)toChinese;
- (id)initWithDate:(NSDate*)date;
+ (LunarCalendar*)initWithDate:(NSDate*)date;
@end

NSString *getChineseCalendarWithDate(NSDate *date);

LunarCalendar.m

//
// LunarCalendar.m
// Clock
//
// Created by shunping liu on 12-7-13.
// Copyright (c) 2012年 tencent. All rights reserved.
//

#import "LunarCalendar.h"

@interface NSDate(custom)
//以年月日初始化一个NSDate对象
+(NSDate*)dateFromYear:(int)year Month:(int)month Day:(int)day;
@end

@implementation NSDate(custom)
//以年月日初始化一个NSDate对象
+(NSDate*)dateFromYear:(int)year Month:(int)month Day:(int)day
{
NSString *date = [NSString stringWithFormat:@"%4d-%02d-%02d", year, month, day];
NSDateFormatter *formater = [[NSDateFormatter alloc] init];
[formater setDateFormat:@"yyyy-MM-dd"];
NSDate *returnDate = [formater dateFromString:date];
[formater release];
return returnDate;
}
@end

@interface LunarCalendar(private)
//返回农历year年的总天数
- (NSInteger)daysOfYear:(NSInteger)year;

//返回农历year年闰月的天数
- (NSInteger)leapDays:(NSInteger)year;

//返回闰月
- (NSInteger)leapMonthOfYear:(NSInteger)year;

//获取某年某一月的天数
- (NSInteger)daysOfMonth:(NSInteger)month Year:(NSInteger)year;

- (void)initCusor;

@end

@implementation LunarCalendar
@synthesize lcYear;
@synthesize lcMonth;
@synthesize lcDay;
@synthesize chineseDays = _chineseDays;
@synthesize chineseMonths = _chineseMonths;

//公历转农历需要用查表法, 没有万能公式

int lunarInfo[] = {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};

- (id)init
{
if (self = [super init]) {
_chineseMonths=[[NSArray arrayWithObjects:
@"正月", @"二月", @"三月", @"四月", @"五月",
@"六月", @"七月", @"八月",
@"九月", @"十月", @"冬月", @"腊月", nil] retain];

_chineseDays=[[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] retain];
}
return self;
}

//计算date对应的农历
- (id)initWithDate:(NSDate*)date
{
if(self = [super init])
{
[self init];
//用户可能会调系统时间.必须支持到1970年,1969冬月23
NSDate *baseDate = [NSDate dateFromYear:1969 Month:12 Day:31];

NSTimeInterval totalTimes = [date timeIntervalSinceDate:baseDate];
NSInteger offset = totalTimes/86400.0;

NSInteger i, leapMonth=0, temp=0;

//补上农历到1970年的差异
offset -= 37;//36天后到农历1970腊月廿九, 后面要补1, 因为是从1号开始

for(i=1970; i0; i++) {
temp = [self daysOfYear:i];
offset -= temp;
}

if(offsetoffset += temp;
i--;
}
self.lcYear = i;

leapMonth = [self leapMonthOfYear:i]; //闰哪个月
isLeap = NO;
for(i=1; i0; i++)
{
//闰月, 有闰月时, 一年有13月
if(leapMonth>0 && i==(leapMonth+1) && isLeap==NO)
{
--i;
isLeap = YES;
temp = [self leapDays:self.lcYear];
}
else
{
temp = [self daysOfMonth:i Year:self.lcYear];
}

//解除闰月
if(isLeap && i==(leapMonth+1))
{
isLeap = NO;
}
offset -= temp;

}

if(offset==0 && leapMonth>0 && i==leapMonth+1)
if(isLeap)
{
isLeap = NO;
}
else
{
isLeap = YES;
--i;
}

if(offset0x8; i>>=1)
{
sum += (lunarInfo[someYear-1900] & i) ? 1: 0;
}
return sum+[self leapDays:someYear];
}

//返回农历year年闰月的天数
- (NSInteger)leapDays:(NSInteger)someYear
{
if([self leapMonthOfYear: someYear])
{
return((lunarInfo[someYear-1900] & 0x10000)? 30: 29);
}
else
{
return(0);

}
}

//返回闰月
- (NSInteger)leapMonthOfYear:(NSInteger)someYear
{
return lunarInfo[someYear-1900] & 0xf;
}

//获取某年某一月的天数
- (NSInteger)daysOfMonth:(NSInteger)aMonth Year:(NSInteger)aYear
{
return( (lunarInfo[aYear-1900] & (0x10000>>aMonth))? 30: 29 );
}

- (NSString*)chineseMonth:(int)aMonth
{
return [self.chineseMonths objectAtIndex:aMonth-1];
}

- (NSString*)chineseDay:(int)aDay
{
return [self.chineseDays objectAtIndex:aDay-1];
}

- (void)dealloc
{
[_chineseDays release];
[_chineseMonths release];
[super dealloc];
}

+ (LunarCalendar*)initWithDate:(NSDate*)date
{
LunarCalendar *lunarCalendar = [[[LunarCalendar alloc] initWithDate:date] autorelease];
return lunarCalendar;
}
@end

NSString *getChineseCalendarWithDate(NSDate *date)
{
/*
NSArray *chineseYears = [NSArray arrayWithObjects:
@"甲子", @"乙丑", @"丙寅", @"丁卯", @"戊辰",
@"己巳", @"庚午", @"辛未", @"壬申", @"癸酉",
@"甲戌", @"乙亥", @"丙子", @"丁丑", @"戊寅",
@"己卯", @"庚辰", @"辛己", @"壬午", @"癸未",
@"甲申", @"乙酉", @"丙戌", @"丁亥", @"戊子",
@"己丑", @"庚寅", @"辛卯", @"壬辰", @"癸巳",
@"甲午", @"乙未", @"丙申", @"丁酉", @"戊戌",
@"己亥", @"庚子", @"辛丑", @"壬寅", @"癸丑",
@"甲辰", @"乙巳", @"丙午", @"丁未", @"戊申",
@"己酉", @"庚戌", @"辛亥", @"壬子", @"癸丑",
@"甲寅", @"乙卯", @"丙辰", @"丁巳", @"戊午",
@"己未", @"庚申", @"辛酉", @"壬戌", @"癸亥", nil];
*/

LunarCalendar *lunar = [LunarCalendar initWithDate:date];

NSString *m_str = [lunar chineseMonth:lunar.lcMonth];
NSString *d_str = [lunar chineseDay:lunar.lcDay];

NSString *chineseCal_str =[NSString stringWithFormat: @"农历%@%@",m_str,d_str];
return chineseCal_str;
}

使用示例
NSString *nonglistr = getChineseCalendarWithDate([NSdate date]);
NSLog(@”%@”, nonglistr);

放到了git上：

https://github.com/bjmayor/layout