将ISO 8601转换为NSDate [英] Convert ISO 8601 to NSDate

问题描述

我有一个来自服务器的时间戳，如下所示：

  2013-04-18T08：49：58.157 + 0000 
  

我尝试删除冒号，我尝试过所有这些：

$ p $ +（NSDate *）dateUsingStringFromAPI



这是我在哪里： ：（NSString *）dateString {


NSDateFormatter * dateFormatter;
dateFormatter = [[NSDateFormatter alloc] init];

// @yyyy-MM-dd'T'HH：mm：ss'Z' - 不起作用
// @yyyy-MM-dd'T' HH：mm：ssZZZ - 不起作用
// @yyyy-MM-dd'T'HH：mm：sss - 不起作用

[dateFormatter setDateFormat： @ YYYY-MM-dd'T'HH：MM：ss'Z'];
[dateFormatter setTimeZone：[NSTimeZone timeZoneWithName：@GMT]];

// NSDateFormatter不喜欢ISO 8601所以去掉毫秒和时区
dateString = [dateString substringWithRange：NSMakeRange（0，[dateString length] -5）];

return [dateFormatter dateFromString：dateString];
}


我最大的问题之一就是我上面的日期格式真的是ISO 8601？我从人们看到的所有例子的格式都有些不同。有些人有 ... 157-0000 ，其他人在最后没有任何东西。

解决方案

这对我有效：

  NSString * dateString = @2013-04-18T08：49：58.157 + 0000; 
 NSDateFormatter * formatter = [[NSDateFormatter alloc] init]; 
 [formatter setDateFormat：@yyyy-MM-dd'T'HH：mm：ss.SSSZ]; 
 //解析固定格式的日期字符串时总是使用这个语言环境
 NSLocale * posix = [[NSLocale alloc] initWithLocaleIdentifier：@en_US_POSIX]; 
 [formatter setLocale：posix]; 
 NSDate * date = [formatter dateFromString：dateString]; 
 NSLog（@date =％@，date）; 
  

I have a timestamp coming from server that looks like this:

2013-04-18T08:49:58.157+0000

I've tried removing the colons, I've tried all of these:

Converting an ISO 8601 timestamp into an NSDate: How does one deal with the UTC time offset?

Why NSDateFormatter can not parse date from ISO 8601 format

Here is where I am at:

+ (NSDate *)dateUsingStringFromAPI:(NSString *)dateString {


    NSDateFormatter *dateFormatter;
    dateFormatter = [[NSDateFormatter alloc] init];

    //@"yyyy-MM-dd'T'HH:mm:ss'Z'" - doesn't work
    //@"yyyy-MM-dd'T'HH:mm:ssZZZ" - doesn't work
    //@"yyyy-MM-dd'T'HH:mm:sss" - doesn't work 

    [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'Z'"];
    [dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];

    // NSDateFormatter does not like ISO 8601 so strip the milliseconds and timezone
    dateString = [dateString substringWithRange:NSMakeRange(0, [dateString length]-5)];

    return [dateFormatter dateFromString:dateString];
}

One of my biggest questions is, is the date format I have above really ISO 8601? All the examples I have seen from people the formats of each are slightly different. Some have ...157-0000, others don't have anything at the end.

解决方案

This works for me:

NSString *dateString = @"2013-04-18T08:49:58.157+0000";
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSSZ"];
// Always use this locale when parsing fixed format date strings
NSLocale *posix = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];
[formatter setLocale:posix];
NSDate *date = [formatter dateFromString:dateString];
NSLog(@"date = %@", date);

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