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我的应用程序是一个通用应用程序，在我的应用程序的一部分中，我必须在日历中添加事件我的代码在 iOS 4.x 和 5.x 中运行良好，但在 i 6.0 中，当我使用日期格式化程序将字符串转换为日期时，它返回下面的 iOS 6.0 中的 null 是代码：-

-(IBAction) addToPlanBttnClick:(id) sender
{
    addToPlanBttn.tag =1;
    EKEventEditViewController *addController = [[EKEventEditViewController alloc] initWithNibName:nil bundle:nil];
    EKEvent *newEvent = [EKEvent eventWithEventStore:eventStore];



    // set event title start date and end date
    NSString *str = conference.SeminarDate;
    str = [[str stringByAppendingString:@" "] stringByAppendingString:conference.StartTime];
    NSLog(@"%@",str);
    newEvent.title = conference.Subject;

    //NSString *pointDate = [[[NSString alloc] initWithString:dateLbl.text]  stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

    // You can use current date or any other
    //NSString *str1 = [[NSString alloc] initWithString:[[pointDate stringByAppendingString:@", 2012 "]stringByAppendingString:[str substringWithRange:NSMakeRange(0, 5)]]];
    //NSLog(@"stri date----%@", str1);
    NSTimeZone *currentTimeZone = [NSTimeZone localTimeZone];
    NSDateFormatter* df = [[NSDateFormatter alloc]init];
    [df setDateFormat:@"EEEE dd MMMM yyyy HH:mm"];

    NSDate* startDate = [df dateFromString:str];


    //[NSDate date];
    NSLog(@"stri date----%@", startDate);
    newEvent.startDate = startDate;
    [newEvent setNotes:conference.BriefDescription];

    NSString *str1 = conference.SeminarDate;
    str1 = [[str1 stringByAppendingString:@" "] stringByAppendingString:conference.EndTime];
    NSLog(@"%@",str1);

    NSDate *endDate = [df dateFromString:str1];
    NSLog(@"stri date----%@", endDate);

    newEvent.endDate = endDate;
    addController.eventStore = self.eventStore;
    addController.event = newEvent;
    addController.editViewDelegate = self;
    [self presentViewController:addController animated:YES completion:nil];
}

我的日期字符串是 2013 年 2 月 12 日星期二 10:00，日期格式化程序[df setDateFormat:@"EEEE dd MMMM yyyy HH:mm"];如代码所示，字符串生成的日期为：-2013-02-12 04:30:00 +0000 在模拟器和 iPad 中

但它在 iOS 6.0 上为空请建议我哪里错了。

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