How to display picker view in MM-dd-yy format in iOS 5.1?

Question

In my application i am using pickerview

My problem is that when in iOS 4.3 Picker view comes MM-dd-yy format,

Answer 1

Change region to United states i.e locale settings

NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:@"US"];
        [datePicker setLocale:locale];