oh hey i found a way
so if anyone wants to do this and is wondering how this could be done, i bypassed a way
what you have to do is get CleanStatus and you can change the colour of your clock to the background colour
as you can see in the pictures, on my springboard, the status bar clock is gone
not actually gone, just that the colour is black so it blends into my background
and in the second picture, when i open an app, in this case safari, the status bar will have the clock there as per normal
hahaha this isn't much os modding to be honest, just an OCD thing of mine cause i already have a large clock on my springboard, so i don't like looking at 2 clocks, just fyi for anyone else who wants to do it

Try using CleanStatus from cydia...it free....