NSDateFormatter错误的时间 [英] Wrong time from NSDateFormatter

问题描述

我有一个字符串，我想从以下地址解析时间：

  NSString * longdate = @2011年3月27日8:38:38 PM 
  

我想解析这个日期，只输出时间部分w / hours + minutes + am / pm ：

  //首先，将我们的字符串转换为NSDate 
 NSDateFormatter * inFormat = [[NSDateFormatter alloc] init] ; 
 [inFormat setDateFormat：@MMM dd，yyyy HH：mm：ss aaa]; 
 NSDate * date = [inFormat dateFromString：longdate]; 
 [inFormat release]; 
 
 //现在从日期转换为字符串
 NSDateFormatter * outFormat = [[NSDateFormatter alloc] init]; 
 [outFormat setDateFormat：@HH：mm aaa]; 
 NSString * final = [outFormat stringFromDate：date]; 
 [outFormat release]; 
 
 NSLog（@original：％@ | final％@，longdate，final）; 
  

问题是最后的时间是错误的。我期待时间是下午8:38，而是下午12:38。

我只是想和我一样的时间，而且不打扰任何时区或地区。我在这里做错了什么？谢谢。

解决方案

发现问题。与时区无关，并且与日期格式化程序使用错误的格式代码有关。

  [inFormat setDateFormat：@ MMM dd，yyyy HH：mm：ss aaa]; 
  

应该是：

  [inFormat setDateFormat：@MMM dd，yyyy h：mm：ss aaa]; 
  

同样，outFormat的dateformat应该是：

< p $ p> [outFormat setDateFormat @h：mm aaa];


在此调整后，即使没有任何TimeZone调整，一切都可以正常运行。

I have a string that I want to parse the time from:

NSString *longdate = @"Mar 27, 2011 8:38:38 PM";

I want to parse this date and output just the time portion w/ hours+minutes+am/pm:

// First, convert our string into an NSDate
NSDateFormatter *inFormat = [[NSDateFormatter alloc] init];
[inFormat setDateFormat:@"MMM dd, yyyy HH:mm:ss aaa"];
NSDate *date = [inFormat dateFromString:longdate];
[inFormat release];

// Now convert from date back to a string
NSDateFormatter *outFormat = [[NSDateFormatter alloc] init];
[outFormat setDateFormat:@"HH:mm aaa"];
NSString *final = [outFormat stringFromDate:date];
[outFormat release];

NSLog(@"original: %@ | final %@", longdate, final);

The problem is the final time is wrong. I expect the time to be 8:38 PM, but instead I get 12:38 PM.

I just want to get the same hour out that I put it, and not bother w/ any time zones or locales. What am I doing wrong here? Thanks.

解决方案

Found the problem. Had nothing to do with timezones and everything to do with using the wrong formatting codes for the date formatter.

[inFormat setDateFormat:@"MMM dd, yyyy HH:mm:ss aaa"];

should be:

[inFormat setDateFormat:@"MMM dd, yyyy h:mm:ss aaa"];

Likewise, outFormat's dateformat should be:

[outFormat setDateFormat:@"h:mm aaa"];

After this adjustment everything works fine even w/o any TimeZone adjustments.

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