Add number of days to a date and calculate the end date?

How can I calculate the number of days from a specific date?in other words add number of days to a date. I looked up NSCalendar and NSdate and could not find anything specific to tha开发者_StackOverflowt regards.

You can use -[NSCalendar components:fromDate:toDate:options:] to compare dates, or -[NSCalendar dateByAddingComponents:toDate:options:] to find a date that is a certain number of days from another date.