uidatapicker date mode on iphone sdk

i am using uidatapicker date mode

and i have a button and i want to get the day of the year when i click on that button

for example if the user chooses 23/3/2010 and then he clicks the button it will tell what day it is of the year - so it will say 82

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there is date method, simply call it (send the message).
 NSDate* selected = [datePicker date];

Here is a full tutorial:
How to Use UIDatePicker From UIKit in iPhone Programming


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