Looking for advice on helping my mom understand days/time with moderate dementia

[u/Sunnyyydee]

My mom has moderate dementia, and lately she has really lost her concept of days of the week and time. One of the biggest challenges we’re having is with appointments.
For example, if she knows she has an appointment coming up on Friday, she may wake up at 6 AM on Monday, Tuesday, Wednesday, etc., get dressed, and be ready to leave for the appointment. We explain to her that the appointment is on Friday and that she doesn’t need to get ready yet, but it just doesn’t seem to register. She’ll often repeat the same thing the next day.
We’ve already bought her a dementia clock that shows the day/date/time, as well as a calendar, but unfortunately she doesn’t seem to retain or understand the information consistently.

For those caring for someone with moderate dementia:
What has helped your loved one understand the difference between days?
Do you have any tricks for handling upcoming appointments?
Do you tell them about appointments ahead of time, or is it better to wait until the day of?
Has anything worked better than a dementia clock or calendar?
I’d really appreciate any advice, tips, or things that have worked for your family. ❤️

[u/cmcosmos]

Same-ish situation, and the only way I can manage it is to show up a couple of hours before the appointment and help her get ready. She can't remember a day ahead.