NSDateFormatter显示错误的一年

问题描述

即时通讯使用xcode 4.5（4G182）和iOS 6. NSDateFormatter在iOS 6中显示错误年份，如何解决？

im using xcode 4.5(4G182) with iOS 6. NSDateFormatter show wrong year in iOS 6, how to solve?

NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:@"YYYY-MM-dd"];
NSString *str = [dateFormatter stringFromDate:[NSDate date]];
NSLog(@"%@ == %@",str,[[dateFormatter dateFromString:str] description]);

打印出来 2012 -09-14 == 2011 -09-13 16:00:00 +0000

it print out "2012-09-14 == 2011-09-13 16:00:00 +0000"

推荐答案

YYYY 与 yyyy 不同。

根据 引用;

`y`: Year
`Y`: Year (in "Week of Year" based calendars). This year designation is used in 
     ISO year-week calendar as defined by ISO 8601, but can be used in 
     non-Gregorian based calendar systems where week date processing is desired. 
     May not always be the same value as calendar year.

执行句是最后一句。请改用 yyyy 。

The operative sentence being the last one. Use yyyyinstead.

有关如何以及为何使用 YYYY 时年份值可能会有所偏差：

Further details on how and why the year values may deviate when using YYYY:

示例：

12月29日星期一 2008 写成 2009 -W01-1

Monday 29 December 2008 is written "2009-W01-1"

周日1月3日 2010 写成 2009 -W53-7

Sunday 3 January 2010 is written "2009-W53-7"

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