namespace Foundation
{
    [Register("NSCalendar", true)]
    public class NSCalendar : NSObject, INSCoding, INSCopying, INSSecureCoding, INativeObject, IDisposable
    {
        public static class Notifications
        {
            public static NSObject! ObserveDayChanged(NSObject! objectToObserve, EventHandler<NSNotificationEventArgs!>! handler);
        }
    }
}