How to add some time to an NSDate

Imagine you had an NSDate object and want to add several days to it. We can use NSDate method dateByAddingComponents for this, which takes – as you may have guessed – NSDateComponents as parameters.

In this example, let’s assume we want to know what date it is 5 days from today:

int daysToAdd = 5;
NSDate *today = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [[NSDateComponents alloc]init];
[components setDay:daysToAdd];
NSDate *futureDate = [gregorian dateByAddingComponents:components toDate:today options:0];

You can add as many and diverse components you like, such as

  • setEra:
  • setYear:
  • setMonth:
  • setDay:
  • setHour:
  • setMinute:
  • setSecond:
  • setWeek:
  • setWeekday:
  • setWeekdayOrdinal:
  • setQuarter:
  • setCalendar:
  • setTimeZone:
  • setWeekOfMonth:
  • setWeekOfYear:
  • setYearForWeekOfYear:

Check out the NSDateComponents Class Reference for more information.

One thought on “How to add some time to an NSDate

  1. The same goes for subtracting time too: simply change the integer to a negative number (say -7) and you’ll be given a date before the current date.

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