在iOS中将日期格式化为dd-MMM [英] Formatting Date to dd-MMM in iOS

问题描述

我一直在搜索，但找不到.我在包含NSDate的NSDictionary中有一个对象.现在，标准的NSDate对象相当长.我想以dd-MMM格式显示用户.

I've been searching this and couldn't quite find it. I have an object in a NSDictionary that contains a NSDate. Now standard NSDate objects are pretty long. and I want to show the user in dd-MMM format.

例如:原始日期可能是2012-04-23 00:00:00 +0000，我希望该日期显示为23 Apr

For eg: The original date may be 2012-04-23 00:00:00 +0000, for which I want the date to appear as 23 Apr

我尝试使用NSDateComponents和NSDateFormatter，但效果不佳.可能我没有弄清楚所需格式的正确用法.

I tried using NSDateComponents and NSDateFormatter but it didn't quite work. Probably I'm not figuring out the correct usage FOR the required format.

下面是用于更好理解的代码:

Here's the code for better understanding:

            NSLog(@"From Dictionary, Date = %@",[tmpDict objectForKey:@"eventDate"]);
            NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
            [dateFormatter setDateFormat: @"yyyy-MM-dd HH:mm:ss Z"]; 
            NSString *dateString = [tmpDict objectForKey: @"eventDate"];
            NSDate *date = [dateFormatter dateFromString: dateString];

            NSLog(@"MY DATE: %@",date);
            NSDateFormatter *dateFormatter2 = [[NSDateFormatter alloc] init];
            [dateFormatter2 setDateFormat:@"dd-MMM"];
            NSString *formattedDateString = [dateFormatter2 stringFromDate:date];
            NSLog(@"Formatted Date: %@",formattedDateString);

对于From Dictionary, Date，输出为2012-05-19 07:30:56，对于格式化日期"和我的日期"，输出为null. tmpDict是我正在使用的Dictionary对象.

The output is 2012-05-19 07:30:56 for From Dictionary, Date and null for Formatted Date and MY DATE. And tmpDict is the Dictionary Object that I'm using.

感谢您的帮助.

推荐答案

来自 Duncan C 的答案

如果日期表示为字符串，请首先将其转换为日期，然后在其上使用NSDateFormatter.假设格式将保持不变

If the date is represented as a string, first turn it into a date and then use the NSDateFormatter on it. Assuming the format will remain the same it would be

[dateFormatter setDateFormat: @"yyyy-MM-dd HH:mm:ss Z"]; 
NSString *dateString = [dictionaryObject objectForKey: @"eventDate"];
NSDate *date = [dateFormatter dateFromString: dateString];

然后，您可以对date对象执行当前操作.

Then you can do what you are doing at the moment to the date object.

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