NSDateFormatter问题 [英] NSDateFormatter Issues

问题描述

我有一个关于NSDateFormatter的问题. 也许我错过了一些东西，但是我的NSDateFormatter不能仅在时间上正确调整日期:

Hi I have a question regarding NSDateFormatter. Maybe Im missing something but my NSDateFormatter is not adjusting the date correctly only the time:

// NSDateFormatter (self.df) initialized in another method.
[self.df setDateFormat:@"MMM dd, YYYY hh:mm a"];
NSString *dpDate = [(UITextField*)[dateCell viewWithTag:101] text];
NSLog(@"tf date: %@",dpDate);
NSDate *date = [[NSDate alloc] init];
date = [self.df dateFromString:dpDate];
NSLog(@"Date: %@",[self.df stringFromDate:date]);

但是在打印后，日期似乎无法正确格式化以下是一些输出:

However after printing it seems the date doesn't format correctly Below are a few outputs:

咨询输出1:

xxx[5262:60b] tf date: Dec 05, 2013 09:35 AM

2013-12-05 09:35:17.718 xxx[5262:60b] Date: Dec 23, 2012 09:35 AM

咨询输出2:

xxx[5262:60b] tf date: Jan 16, 2014 09:45 AM

2013-12-05 09:36:21.151 xxx[5262:60b] Date: Dec 22, 2013 09:45 AM

此外，我只设置一次dateFormat.

In addition, I am only setting the dateFormat once.

推荐答案

您需要使用yyyy，而不是YYYY.第一个是常规年份(相对于配置的日历)，第二个是基于基于周的日历年.

You need to use yyyy, not YYYY. The first is the regular year number (with respect to the configured calendar) and the second is for week-based calendar year.

有关如何使用NSDateFormatter的信息，请参见详细文章.两者之间的区别.

See this detailed article on how to use NSDateFormatter, and the distinction between the two.

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