Question

I am a new to objective C, I am developing a app to determine the date of birth when user gives the year and the number of days. For example if user give 1985 as his/her year of birth and the number of days as 311. his/here date of birth is 1985 November 6. So how to get the November 6 from 311 in 1985 ? Please help

Answer 1

You should never have to calculate whether the current year is a leap year or not. Never ever ever. Let the frameworks do that for you. People much more intelligent than you or I have done this for us already, so why on earth would we go about re-inventing this wheel with sub-optimal algorithms that would never account for all of the intricate calendar variations?

It’s stupid to do this yourself. So don’t:

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *startComponents = [[NSDateComponents alloc] init];
[startComponents setYear:1985];
[startComponents setDay:311];

NSDate *date = [gregorian dateFromComponents:startComponents];

NSLog(@"endDate: %@", date);

This logs:

endDate: 1985-11-07 08:00:00 +0000