I would start by looking at EKRecurrenceRule 
<https://developer.apple.com/library/ios/documentation/EventKit/Reference/EKRecurrenceRuleClassRef/index.html>.


Jeff Kelley

slauncha...@gmail.com | @SlaunchaMan <https://twitter.com/SlaunchaMan> | 
jeffkelley.org <http://jeffkelley.org/>


> On Feb 16, 2016, at 9:34 PM, Eric Gorr <mail...@ericgorr.net> wrote:
> 
> When setting up a repeating event in Apple’s Calendar application, there is a 
> lot of flexibility. For example, I can specify that an event repeats every 
> month on the 5th Saturday. Of course, not every month has a fifth saturday, 
> so for that month there is no event.
> 
> What I am wondering is if there is direct api support for doing these date 
> calculations…can I supply a set of parameters to a function and ask what the 
> next 5th saturday of the month is?
> 
> I can, of course, implement a naive algorithm which simply iterates through 
> each day of the month, checks to see if it is the 5th Saturday encountered 
> and return that date, but I am hoping I would not need to write something so 
> tedious and prone to error. If there is a 3rd party library that would 
> provide such support, I would be interested in learning about it as well.
> 
> Thank you.
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