Hello Anthony. I am so glad that you have found this site; you’ll find a mass of useful information on the boards here.
TP members, between them, have encountered almost every possible manifestation of the illnesses you mention.
I would suggest that your first move might be to head straight for the, “I care for someone with Dementia.” section of the Forum.
There, you’ll find a range of topics seeking advice on the full range of Alzheimer’s/dementia symptoms. Of course, there are always new things that will concern carers, but they usually manage to come up with some helpful suggestions; and it seems to help us all to discuss our anxiety with other people in a similar situation.
The two symptoms you mention are not untypical for someone suffering from Alzheimer’s. My husband, who is eighty eight, constantly asks me what day it is today. He must have asked me twenty times today.
Your father you say is deaf and nearly blind; so he has no way to discover what time it is, except by asking someone.
I am afraid that I can only suggest that you set a timer to remind you to tell him the time every half hour. At least it would avoid the irritation of constant requests for information if you can get the info. in first
I am sure others will have experience of the sufferer believing they have not been fed, or received some other service they feel they merit.
Anyway - please keep posting, and the members will usually be able to help, or at least sympathise.