NSDateFormatter transition to NSString error

Question

here is the code

NSDateFormatter* formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"YYYY-MM-dd"];
NSString * dateNow = [formatter stringFromDate:[NSDate date]];

and the debugger shows

and why the number of the year is 2016?

Answer 1

Use yyyy instead of YYYY in your NSDateFormatter as

[formatter setDateFormat:@"yyyy-MM-dd"];
---------------------------^^^^

why the number of the year is 2016?

The reason being:

The "YYYY" is a week-based calendar year.

The "yyyy" is an ordinary calendar year.