Quan? tum?

Ohkay. So the orbital song goes ‘even a stopped clock keeps the right time twice a day.’

What I want to know is how the heisenberg principle effects this. My understanding is that no clock keeps the right time. Due to the fact that the very moment you realize what the clock is telling you, it’s already not that time. There’s a fine event horizon between before and after. So, when is ‘now?’