在iPhone上解析JSON日期 [英] Parsing JSON dates on IPhone

问题描述

我正在从/ Date（xxxxxxxxxxxxx-xxxx）/格式的.NET webservice中取回日期。我正在寻找一个关于如何最好地解析为NSDate对象的方向。我试过使用dateWithTimeIntervalSince1970，但它在1969年的一个日期回来，我知道是在2006年。

寻找适当的方向

提前感谢

解决方案

作为.NET程序员学习Objective-C，当我尝试使用.Net WebService时，我遇到了同样的问题。

起初我以为我可以使用NSDateFormatter ...
我发现一个非常好的参考它的符号这里，但我很快意识到，我需要将数字从毫秒转换为秒。

我写了代码要做...
我还在学习Obj-C，但我不认为这应该是这么难...

   - （NSDate *）getJSONDate {
 NSString * header = @/ Date（; 
 uint headerLength = [header length]; 
 
 NSString * timestampString; 
 
 NSScanner * scanner = [[NSScanner alloc] initWithString：self]; 
 [scanner setScanLocation：headerLength]; 
 [scanner scanUpToString：@）intoString：& timestampString]; 
 
 NSCharacterSet * timezoneDelimiter = [NSCharacterSet characterSetWithCharactersInString：@+  - ]; 
 NSRange rangeOfTimezoneSymbol = [timestampString rangeOfCharacterFromSet：timezoneDelimiter]; 
 
 [scanner dealloc]; 
 
 if（rangeOfTimezoneSymbol.length！= 0）{
 scanner = [[NSScanner alloc] initWithString：timestampString]; 
 
 NSRange rangeOfFirstNumber; 
 rangeOfFirstNumber.location = 0; 
 rangeOfFirstNumber.length = rangeOfTimezoneSymbol.location; 
 
 NSRange rangeOfSecondNumber; 
 rangeOfSecondNumber.location = rangeOfTimezoneSymbol.location + 1; 
 rangeOfSecondNumber.length = [timestampString length]  -  rangeOfSecondNumber.location; 
 
 NSString * firstNumberString = [timestampString substringWithRange：rangeOfFirstNumber]; 
 NSString * secondNumberString = [timampString substringWithRange：rangeOfSecondNumber]; 
 
 unsigned long long firstNumber = [firstNumberString longLongValue]; 
 uint secondNumber = [secondNumberString intValue]; 
 
 NSTimeInterval interval = firstNumber / 1000; 
 
 return [NSDate dateWithTimeIntervalSince1970：interval]; 
} 
 
 unsigned long long firstNumber = [timestampString longLongValue]; 
 NSTimeInterval interval = firstNumber / 1000; 
 
 return [NSDate dateWithTimeIntervalSince1970：interval]; 
} 
  

希望有人可以提供更好的Obj-C解决方案。
如果不是我可以保留这个或寻找一种方法来更改.NET中的序列化格式

编辑：

关于JSON DateTime格式...
如果您对该服务有任何控制，最好将日期转换为DataContract对象中的字符串。

格式化到RFC1123 现在似乎是一个好主意。因为我可以很容易地使用NSDateFormatter来取代它。

从 Rick Strahl

没有JavaScript日期文字，微软设计了一个自定义日期格式这本质上是一个标记的字符串。格式是一个编码的字符串，包含标准的新日期（自1970年以来的毫秒）值。

Forgive me as I'm new to Objective C.

I am getting back dates from a .NET webservice in the /Date(xxxxxxxxxxxxx-xxxx)/ format. I'm looking for some direction on how to best parse this into an NSDate object. I've tried using dateWithTimeIntervalSince1970 on it but it comes back with a date in the year 1969 for a date I know is in 2006.

Looking for some direction on the proper way to handle JSON dates.

Thanks in advance!

解决方案

As a .NET programmer learning Objective-C I had the same problem when I tried to consume a .Net WebService.

At first I thought I would be able to use the NSDateFormatter... I found a really good reference for it's symbols here, but I quickly realized that I needed to convert the number from milliseconds to seconds.

I wrote the code to do it... I'm still learning Obj-C but I dont think It should've been this hard...

- (NSDate *) getJSONDate{
    NSString* header = @"/Date(";
    uint headerLength = [header length];

    NSString*  timestampString;

    NSScanner* scanner = [[NSScanner alloc] initWithString:self];
    [scanner setScanLocation:headerLength];
    [scanner scanUpToString:@")" intoString:&timestampString];

    NSCharacterSet* timezoneDelimiter = [NSCharacterSet characterSetWithCharactersInString:@"+-"];
    NSRange rangeOfTimezoneSymbol = [timestampString rangeOfCharacterFromSet:timezoneDelimiter];

    [scanner dealloc];

    if (rangeOfTimezoneSymbol.length!=0) {
        scanner = [[NSScanner alloc] initWithString:timestampString];

        NSRange rangeOfFirstNumber;
        rangeOfFirstNumber.location = 0;
        rangeOfFirstNumber.length = rangeOfTimezoneSymbol.location;

        NSRange rangeOfSecondNumber;
        rangeOfSecondNumber.location = rangeOfTimezoneSymbol.location + 1;
        rangeOfSecondNumber.length = [timestampString length] - rangeOfSecondNumber.location;

        NSString* firstNumberString = [timestampString substringWithRange:rangeOfFirstNumber];
        NSString* secondNumberString = [timestampString substringWithRange:rangeOfSecondNumber];

        unsigned long long firstNumber = [firstNumberString longLongValue];
        uint secondNumber = [secondNumberString intValue];

         NSTimeInterval interval = firstNumber/1000;

        return [NSDate dateWithTimeIntervalSince1970:interval];
    }

    unsigned long long firstNumber = [timestampString longLongValue];
    NSTimeInterval interval = firstNumber/1000;

    return [NSDate dateWithTimeIntervalSince1970:interval];
}

Hopefully someone can provide a better Obj-C solution. If not I may keep this or look for a way to change the serialization format in .NET

EDIT:

About that JSON DateTime format... If you have any control on the service it would probably be best to convert the date to a string in your DataContract objects.

Formatting to RFC1123 seems like a good idea to me right now. As I can probably pick it up easily using a NSDateFormatter.

Quote from Rick Strahl

There's no JavaScript date literal and Microsoft engineered a custom date format that is essentially a marked up string. The format is a string that's encoded and contains the standard new Date(milliseconds since 1970) value.

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