NSNotificationCenter - Send extra information from receiver to callback function.

Hi,

I am using NSNotificationCenter to capture the date change event in the following way:

- (void) RegisterForOSNotification
{
NSNotificationCenter * nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self
       selector:@selector(OSNotificationCallback:)
           name:NSSystemClockDidChangeNotification
         object:nil];
}

And this is the callback function:

- (void) OSNotificationCallback: (NSNotification *) pNotification
{
// Time was changed. Log a value here.
}

How can I pass an int value to the callback function from the RegisterForOSNotification function so that I can log the same or use it further for some processing? Is this possible?