My Mum 75 with moderate Alzheimers was diagnsoed 2.5 yrs ago.
In recent months she has gone to forgetting what day it was, to not understanding hours, days, weeks, months.
Mum and Dad live in their own house in front of us.
We can all be home on the weekend, and my two children in their normal clothes ( they wear a school uniform) and my Mum will ask them if they have are going to school, and that I am late for work.
We can be home all day with the cars in the driveway, doors open, music playing, but if she hasn't seen us, she thinks we have gone out, or we are at work/school.
If you write on her whiteboard what days she has her Alzheimers groups, and she asks you what day it is, even if its a Saturday or Sunday, she thinks she has to get ready.
She was also waking early hours of the morning thinking it was time to get ready.
I downloaded a programme off a UK internet site and put it on an SD card, and on a digital photo frame, and it tells the day of the week and if its morning, afternoon, evening or night, plus a pic of the sun, moon etc.
For the first week it worked OK... But then it was if it was frighetning her.
She would wake in the morning and of course it would say the new day, and she said it gave her the fright of her life. Mum was also anxious over when it would change from morning to afternoon etc She told me it was driving her mad and getting her all mixed up, so I took it away.
When ever Mum asks what day it is, I tell her matter of factly and she accepts it.
Or even if she asks if we are gong to work etc, I say not today its Saturday.
Mum isn't upset over it, but I suppose other people could be, so you have to find what works with the least upset.