Thanks Bartosz, As for Timer0 my understanding was that to get a full function RTC you needed both Timer0 and Timer1 but since you mentioned that I reviewed the tutorials and this doesn't seem to be the case?

So does this mean I can use Timer0 as the RTC, Timer1 as the baud rate generator and Timer2 as just a timer to allow calculations of time differences?

And again if this is correct can I interrupt (stop) Timer0 (hopefully using a signal rather than something mechanical like a pushbutton) and have it reset with the new time without stopping or interrupting Timer2?

Thanks all