问题格式化日期使用NSDateFormatter [英] Problem formatting date using NSDateFormatter

问题描述

我有以下日期：

2011-09-09T18:01:47Z

我想让它显示为

9 / 9/11 at 1:47 PM任何正确的时间

此代码返回一个空字符串：

This code returns a null string:

NSLog(@"TIME: %@",[message valueForKey:@"created_at"]);
    NSString* time = [message valueForKey:@"created_at"];
    NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"MM-dd-yy at HH:mm:ss"];
    NSDate* newTime = [dateFormatter dateFromString:time];
    [dateFormatter setDateFormat:@"MM-dd-yy at HH:mm:ss"];
    NSString* finalTime = [dateFormatter stringFromDate:newTime];

推荐答案

与您的输入和输出无关。每当遇到问题时，请参阅 Unicode数据格式模式。

Your formatting is the same for both and they have little to no relation to your input and your output. Refer to the Unicode Data Format Patterns whenever you have issues.

NSString *datein = @"2011-09-09T18:01:47Z";

NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init];
//The Z at the end of your string represents Zulu which is UTC
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
[dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'Z'"];
NSDate* newTime = [dateFormatter dateFromString:datein];

//Add the following line to display the time in the local time zone
[dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
[dateFormatter setDateFormat:@"M/d/yy 'at' h:mma"];
NSString* finalTime = [dateFormatter stringFromDate:newTime];
NSLog(@"%@", finalTime);

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