dateFromString在ios 6中工作，但不在ios 5中工作 [英] dateFromString working in ios 6 but not in ios 5

问题描述

此代码适用于iOS 6.0模拟器，但不适用于iOS 5.0

This code working on iOS 6.0 simulator, but not working on iOS 5.0

NSString *unformattedDate = @"2008-09-25T20:41:11.000+00:00";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ"];
NSDate *dateFromString = [dateFormatter dateFromString:unformattedDate];
[dateFormatter setDateFormat:@"dd.MM.yy"];
NSLog(@"%@", [dateFormatter stringFromDate:dateFromString]);

可能出现什么问题？

推荐答案

由于在iOS 6中添加了 ZZZZZ 日期格式说明符，因此无法格式化时区为<$ c $的日期c> +99：99 iOS版格式。两个版本都使用 ZZZZ +9999 格式C $ C>。如果你知道你的日期/时间字符串将始终带有冒号的时区，那么你可以去掉冒号。

Since the ZZZZZ date format specifier was added in iOS 6, you can't format dates that have a timezone in the +99:99 format with iOS 5. Both versions do support the +9999 format using ZZZZ. If you know that your date/time strings will always have a timezone with the colon, then you can strip the colon.

NSString *unformattedDate = @"2008-09-25T20:41:11.000+00:00";
NSRange range = [unformattedDate rangeOfString:@":" options:NSBackwardsSearch];
if (range.location != NSNotFound && range.location >= unformattedDate.length - 4) {
    unformattedDate = [unformattedDate stringByReplacingCharactersInRange:range withString:@""];
}
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSLocale *posix = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];
[dateFormatter setLocale:locale];
[dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSSZZZZ"];
NSDate *dateFromString = [dateFormatter dateFromString:unformattedDate];
[dateFormatter setDateFormat:@"dd.MM.yy"];
NSLog(@"%@", [dateFormatter stringFromDate:dateFromString]);

请注意，对于这样的固定格式，您必须将格式化程序的语言环境设置为特殊的en_US_POSIX语言环境。

Note that with fixed formats like this, you must set the formatter's locale to the special "en_US_POSIX" locale.

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