NSDateFormatter无法正常工作？ [英] NSDateFormatter not working properly?

问题描述

我的代码，

-(NSString *)trimDateStringInRequiredFormat:(NSString *)dateInString{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd hh:mm:ss"];
    NSDate *date = [dateFormatter dateFromString:dateInString];
    [dateFormatter setDateFormat:@"hh:mm aaa"];
    NSString *dateDisplay = [dateFormatter stringFromDate:date];
    return dateDisplay;
}

当我的日期是2012-06-06 12:00时，上述工作正常：00，我得到了合适的输出，如上午12:00。但是当我发送我的日期像2012-06-06 15:00:00它没有返回我适当的输出，相反，它返回我null输出。当我试图追踪这个函数时，2012-06-06 15:00:00日期 NSDate * date = [dateFormatter dateFromString：dateInString]; 此行不正确转换。为什么会这样？我在这个代码中哪里错了???

The above worked properly when my date is 2012-06-06 12:00:00 and I got appropriate output like 12:00 AM. But when I send my date like 2012-06-06 15:00:00 it doesn't return me appropriate output, instead, it returns me null output. When I'm trying to trace this function the 2012-06-06 15:00:00 date on NSDate *date = [dateFormatter dateFromString:dateInString]; this line not properly converted. Why did this happen? where am I wrong in this code???

推荐答案

尝试做：

[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

用hh你有12h格式，用HH你用24h格式

With hh you have the 12h format, with HH you use 24h format

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