> > > The total time to be checked is 5 years and the resolution 
> > > has to be 1 minute.
> >
> >You simply won't get that accuracy over 5 years with a PIC's 
> >TMR. An external timing source is needed
> >
> AFAICT the OP only requires a resolution of 1 minute, not an accuracy
> of 1 minute in 5 years

Hi Mike, if that were the case then the "5 years" is irrelevant. You may
as well take the reading for the day and start afresh

If the OP would care to enlighten us.........

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