字符串值不转换为日期格式 [英] String value not converting to date format

问题描述

字符串值不转换为日期格式。请参阅下面的代码...

  {
 NSString * TempDate = [NSString stringWithFormat：@％@％@ ％@，Datelbl.text，yearString，TimeLbl.text]; // result is Thursday，November 21 2013 3:05 PM 
 
 NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init]; 
 [dateFormatter setDateFormat：[NSDateFormatter dateFormatFromTemplate：@EEEE，MMMM d yyyy hh：mm aoptions：0 locale：[NSLocale currentLocale]]]; 
 
 AppointmentDate = [dateFormatter dateFromString：TempDate]; // in .h file NSDate * AppointmentDate; 
 
} 
  

我的问题是appointmentDate显示nil值？为什么？

$ p> [dateFormatter setDateFormat：@EEEE'，'MMMM d yyyy hh：mm a];


您需要转义不是格式（逗号）一部分的字符。

我试过，现在工作了：

  NSString * date = @ ，November 21 2013 3:05 PM; 
 
 NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init]; 
 [dateFormatter setDateFormat：@EEEE'，'MMMM d yyyy hh：mm a]; 
 
 NSDate * AppointmentDate = [dateFormatter dateFromString：date]; 
  

如果您的语言环境不是英语，请添加：

  NSLocale * usLocale = [[NSLocale alloc] initWithLocaleIdentifier：@en_US]; 
 [dateFormatter setLocale：usLocale]; 
  

String value not converting to date format. see my code below...

    { 
NSString * TempDate = [NSString stringWithFormat:@"%@ %@ %@",Datelbl.text,yearString,TimeLbl.text]; // result is Thursday, November 21 2013 3:05 PM

        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat : [NSDateFormatter dateFormatFromTemplate:@"EEEE, MMMM d yyyy hh:mm a" options:0 locale:[NSLocale currentLocale]]];

        AppointmentDate = [dateFormatter dateFromString:TempDate];// in .h file  NSDate *AppointmentDate;

    }

My problem is appointmentDate displaying nil value?? why ? whats my mistake!!!

解决方案

Try this format:

[dateFormatter setDateFormat :@"EEEE',' MMMM d yyyy hh:mm a"];

You need to escape the character that is not part of the format (the comma).

I tried and it works now:

NSString *date = @"Thursday, November 21 2013 3:05 PM";

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat :@"EEEE',' MMMM d yyyy hh:mm a"];

NSDate *AppointmentDate = [dateFormatter dateFromString:date];

If your locale is not english, add this:

NSLocale *usLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
[dateFormatter setLocale:usLocale];

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