How do you handle time management and calendar?

My husband's issues are remarkably similar to @maryvc 's husband's .
I tried the paper wall calendar, but he'd get me up at 3 in the morning for an afternoon appointment that was three days later. When I showed him the calendar, he'd say it was just my opinion or I was lying. I tossed the calendar and used my phone calendar. He also got confused over reminder notes, so I started leaving them at his place at the table only on the morning of the appointment. I make sure to schedule his appointments, whenever possible, for late morning or early afternoon, so his schedule can be more consistent. This has helped - for now.
As to the "Senior clocks," they worked for a while, but then he started to accuse me of changing the times, or that they were broken, or that someone from the "clock company" had come in and changed them.
I now just tell him that if we are late, the office will call, and we'll just dash right over. When they don't call, I can usually convince him the appointment is another time.
I hope these suggestions can be helpful, and I thank everyone for their ideas too. I agree that there are no websites or pamphlets that solve all these problems. But everyone here is a big help.

We can’t do a monthly calendar. The refrigerator white board for the day works somewhat. He still asks many times what we are doing. Has no real conception of time.

My wife, who has MCI and has just tested positive for alzheimers being present, and I go over a month at a view physical calendar on the wall. By going over appointments daily helps as she easily confuses dates and actions.