How to add a number of weeks to an NSDate?

Question

I have in the past used the below function to add on a specific time interval using NSDateComponents to an existing date.

(NSDate *)dateByAddin         


        

Answer 1

Just use weekOfYear:

Apple docs for NSDateComponents week:

Deprecation Statement
Use weekOfYear or weekOfMonth instead, depending on what you intend.

NSDate *date = [NSDate date];
NSDateComponents *comp = [NSDateComponents new];
comp.weekOfYear = 3;
NSDate *date1 = [[NSCalendar currentCalendar] dateByAddingComponents:comp toDate:date options:0];
NSLog(@"date:  %@", date);
NSLog(@"date1: %@", date1);

Output:

     
date:  2015-01-13 04:06:26 +0000  
date1: 2015-02-03 04:06:26 +0000

If you use week you get this warning:

'week' is deprecated: first deprecated in ... - Use weekOfMonth or weekOfYear, depending on which you mean

When using the weekOfMonth or weekOfYear as a delta they work the same. Where they are different is when they are used to obtain the week number where you will get the week of the month with a range of 6 or the week of the year with a range of 53.