Open Clock app programmatically in Objective c (Not Device Settings)

Question

I need to open iOS system Clock app from my application. It's easy to open app settings using:

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]]; 

But i need to open clock app exactly. Does it really work ? If yes, then how. I tried with these, nothing works:

In Source :

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"clock-alarm:"]]