Sync iPhone Clock with Atomic Clock

I bought a couple of apps that connect to the Atomic time server and although they work well, all they can do is show me the time difference between the iPhone clock and the real time on the Atomic clock server (offset).
I wrote to the app's manufacturer and they told me that apple will not allow them access to the iPhone's clock so that it can be corrected.
I am just wondering why.
I really hope it is not because apple plan to launch a new phone sometime in the future with this function!
I know it must be possible and relatively easy for apple to enable this feature on the iphone so please somebody please explain to me the real reason for this. Almost every phone I have ever owned has had the ability to be updated and synced by either my pc or some app, so I really can't understand why apple would have disabled this feature. I have my clock set to automatically update itself but it is ALWAYS about 30 seconds off! What's the point of that?
Does anyone know of any way to enable this feature so that my iphone clock updates itself every time I connect it to my PC for example?
Many Thanks in advance for your help.