iOS：DatePicker选择器显示确切的值但它返回错误的日期

Question

我以编程方式为ios 7创建了一个日期选择器，并设置了最大和最小日期。但是在某些特定的12月日，它会返回错误的年份。

    [fromDatePicker addTarget:self action:@selector(fromDatePickerAction:) forControlEvents:UIControlEventValueChanged];
    NSDate *date = [NSDate date];
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar];
    NSDateComponents * components = [[NSDateComponents alloc] init];
    NSDateComponents *monthComponents = [gregorian components:NSMonthCalendarUnit fromDate:date];
    int currentMonth = [monthComponents month];
    NSDateComponents *dayComponents = [gregorian components:NSDayCalendarUnit fromDate:date];
    int dayss=[dayComponents day];
    [components setYear:0];
    NSDate * minDate = [gregorian dateByAddingComponents: components toDate: date options: 0];
    [components setYear:0];
    [components setMonth:12-currentMonth];
    [components setDay:31-dayss];
    NSDate * maxDate = [gregorian dateByAddingComponents: components toDate: date options: 0];
    fromDatePicker.minimumDate=minDate;
    fromDatePicker.maximumDate=maxDate;
    [self.view addSubview:fromDatePicker];

- (void) fromDatePickerAction:(id)sender{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"YYYY-MM-dd hh:mm aa"];
[self.delegate didTouchAddNotePicker:[dateFormatter stringFromDate:[fromDatePicker date]]];
NSLog(@"%@",[dateFormatter stringFromDate:[fromDatePicker date]]);
//_lblDate.text=[dateFormatter stringFromDate:[fromDatePicker date]];

}

在这里，我选择图1所示的日期。但它返回图2中的日期

请帮助解决这个问题

Answer 1

通过将[dateFormatter setDateFormat：@＆＃34; YYYY-MM-dd hh：mm aa＆＃34;]更改为[dateFormatter setDateFormat：@＆＃34; yyyy-MM-dd hh：mm aa＆ ＃34;]在日期选择器选择器方法

中

Please click this link to know about the difference between YYYY and yyyy