Thread1: EXC_BAD_ACCESS(code=1,address=0x5146a345) - ios

Question

i am trying to implement calendar. i have one label for year and two buttons for incrementing and decrementing year from calendar. i am getting this exception (Thread1: EXC_BAD_ACCESS(code=1,address=0x5146a345)) while clicking button(increment or decrement)my requirement is if i click right button my year should increase as well as if i click left button my year should decrease. my exception line is date = [cal dateByAddingUnit:NSCalendarUnitYear value:1 toDate:date options:0]; could you please help to resolve this issue. this is my code
- (void)viewDidLoad
{
[super viewDidLoad];
date = [NSDate date];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"YYYY"];
NSString *stringFromDate = [formatter stringFromDate:date];
yar1.text=stringFromDate;
}
- (IBAction)right:(id)sender {
NSCalendar *cal = [NSCalendar currentCalendar];
date = [cal dateByAddingUnit:NSCalendarUnitYear value:1 toDate:date options:0];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"YYYY"];
NSString *stringFromDate = [formatter stringFromDate:date];
yar1.text=stringFromDate;
}
- (IBAction)left:(id)sender {
NSCalendar *cal = [NSCalendar currentCalendar];
date = [cal dateByAddingUnit:NSCalendarUnitYear value:1 toDate:date options:0];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"YYYY"];
NSString *stringFromDate = [formatter stringFromDate:date];
yar1.text=stringFromDate;
}

Answer 1

You need a date component to change the date like this,
-(NSDate *)offsetYear:(int)numOfYears date:(NSDate*)date
{
NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
[offsetComponents setYear:numOfYears];
return [[NSCalendar currentCalendar] dateByAddingComponents:offsetComponents
toDate:date options:0]; }
Pass the offset as 1 for right and -1 for left