So if you went in to work and nobody was there, and your computer says it's Saturday, and your watch says Saturday, and the next thirty people you ask say it's Saturday... you would still believe it's Friday?

If you think it's Saturday after any amount of evidence, after assigning probability 1 to the statement "Today is Friday," then you can't be doing anything vaguely rational - no amount of Bayesian updating will allow you to update away from probability 1.

If you ever assign something probability 1, you can never be rationally convinced of its falsehood.