Question

我正在尝试将NSCalendar与NSIslamicCalendar标识符一起使用。但是结果并不好，她是我的代码：

NSCalendar *calandar = [[NSCalendar alloc]initWithCalendarIdentifier:NSIslamicCalendar];    
NSDateComponents *components = [calandar components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:[NSDate date]];
NSInteger theDay = [components day];
NSInteger theMonth = [components month];
NSInteger theYear = [components year];


[components setDay:theDay];
[components setMonth:theMonth];
[components setYear:theYear];
NSDate *thisDate = [calandar dateFromComponents:components];    
NSLog(@"year=%i month=%i day=%i",theYear,theMonth,theDay);
NSLog(@"thisdate = %@", [thisDate description]);


NSString *strDate = [NSString stringWithFormat:@"%i-%i-%i",theYear,theMonth,theDay];
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"yyyy-MM-dd"];
NSDate *datee = [formatter dateFromString:strDate];
NSLog(@"datee = %@", [datee description]);

日志：

year=1434 month=2 day=28              ----> all good (it's islamic calandar)
thisdate = 2013-01-09 23:00:00 +0000  ----> not good (we are in 2013-01-10 not 09).
datee = 1434-02-27 23:19:16 +0000     ----> not good (we are in 1434-02-28 not 27)

正如你所看到的那样，第一个日期是正确的，而不是另外两个，而且时间也不正确（当我编译它的时间大约是14:20时），它在最后2个最后一个日志（23:00:00 vs 23）之间有所不同：19：16）

此代码位于我的viewDidload：函数中，并且之前或之后没有运行其他代码。

此外，如果我想获得一个月内的天数，我还会再来一天：

NSCalendar *c = [[NSCalendar alloc]initWithCalendarIdentifier:NSIslamicCalendar];
NSRange dayRange = [c rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:date];
NSLog(@"dayRange.length = %i",dayRange.length);

日志：

dayRange.length = 30 -----> but this islamic month have 29 day not 30.

问题是什么，我该如何解决？谢谢。

修改的

对NSGregorianCalendar来说似乎是相同的，一个区别是日计数是正确的。使用NSGregorianCalendar

进行日志记录

 year=2013 month=1 day=10                -----> all good
 thisdate = 2013-01-09 23:00:00 +0000    -----> not good
 datee = 2013-01-09 23:00:00 +0000       -----> not good

 dayRange.length = 31 ------------------------> all good

Answer 1

datee = 1434-02-27 23:19:16 +0000这可能是伊斯兰日历的特色吗？就像伊斯兰教一样，祈祷的时间与日出方程有关，它可以试图在某个点上表达太阳时间。即在沙特阿拉伯，太阳时间是出于宗教原因的唯一有效时间。他们拒绝给同一块土地一次。如果太阳位于最高点，则为12:00。因为在相距几百公里的城市中差不多，沙特阿拉伯的城市有不同的时间。

请注意，尽管在任何其他伊斯兰国家/地区使用了正常时区，但这种实现方式仍然有意义，因为伊斯兰日历最有效的用例可能是计算宗教事件 - 如果我使用Sun，它会变得更加容易时间。

使用此代码

    NSCalendar *islamicCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSIslamicCalendar];

     NSDate *today = [NSDate date];
    [islamicCalendar rangeOfUnit:NSDayCalendarUnit startDate:&today interval:NULL forDate:today];

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setCalendar:islamicCalendar];
    [dateFormatter setTimeStyle:NSDateFormatterFullStyle];
    [dateFormatter setDateStyle:NSDateFormatterFullStyle];

    //english output 
    dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];

    NSString * islamicDateString = [dateFormatter stringFromDate:today];
    NSLog(@"%@", islamicDateString);

导致

2013-01-11 01:13:46.110 islamicCalendarTest[18346:303] Friday, Safar 29, 1434 12:00:00 AM Central European Standard Time

NSDateFormatter会考虑您的默认时区。

Answer 2

time is not correct (when i compile it's about 14:20) and it differs between the last 2 last log (23:00:00 vs 23:19:16).

这是因为GMT与您的本地区域之间存在时区差异。

Answer 3

// Create a Gregorian Calendar
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

// Set up components of a Gregorian date
NSDateComponents *gregorianComponents = [[NSCalendar currentCalendar] components:NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit fromDate:[NSDate date]];

NSLog(@"[In Gregorian calendar ->] Day: %ld, Month: %ld, Year:%ld",
      (long)[gregorianComponents day],
      (long)[gregorianComponents month],
      (long)[gregorianComponents year]);


gregorianComponents.day = [gregorianComponents day];
gregorianComponents.month = [gregorianComponents month];
gregorianComponents.year = [gregorianComponents year];

// Create the date
NSDate *date = [gregorianCalendar dateFromComponents:gregorianComponents];



// Then create an Islamic calendar
NSCalendar *hijriCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSIslamicCivilCalendar];

// And grab those date components for the same date
NSDateComponents *hijriComponents = [hijriCalendar components:(NSDayCalendarUnit |
                                                               NSMonthCalendarUnit |
                                                               NSYearCalendarUnit)
                                                     fromDate:date];


NSLog(@"[In Hijri calendar ->] Day: %ld, Month: %ld, Year:%ld",
      (long)[hijriComponents day],
      (long)[hijriComponents month],
      (long)[hijriComponents year]);

Answer 4

这里所有的答案都是好的方法，但是只是从科学的角度来看。但是，实际上，当开发人员居住在土耳其并且知道这个问题的根源时，苹果公司有多个伊斯兰日历标识符。

- NSCalendarIdentifierIslamic
- NSCalendarIdentifierIslamicCivil
- NSCalendarIdentifierIslamicTabular
- NSCalendarIdentifierIslamicCivilUmmAlQura

我认为他正在寻找的是NSCalendarIdentifierIslamicCivil。我的应用程序中也有回历日历，NSCalendarIdentifierIslamicCivil解决了该问题

NSCalendar日期错误

4 个答案: