Should I ever be tempted to make an analogue equivalent, it was worth learning that https://www.youngtownco.com/en/product-655753/Moon-Phase-Clo... is a thing.
Semi related- did I read this righr that Portugal has a bin collection every day bar Sunday? (that sounds like a lot! I'm from the UK and where I live there's one a week)
Currently I have 3 recurring events in my calendar that remind me the night before.
> Also, I really didn't want yet another thing with [...] code to debug (there comes a time in every programmer's life when they can't face debugging yet another thing that should be simple and just work)
... when two paragraphs later comes the code to generate a SVG :)
Doesn't your council give a fridge magnet which has the dates in the calendar printed clearly?
Why overcomplicate?
I made a simple web app for her that showed the time along with the bold text MORNING, AFTERNOON, EVENING etc. I set this up on her tablet by the wall, but every time I visited it had been switched off (all the way), and she had no memory of it being set up. (Presumably her bedtime routine involved "turning off the computer"...)
So I just bought her an analog Alzheimer's clock (a 24 hour clock with some colors and pictures to indicate the time of day -- quite similar to OP's design actually). She took readily to that one.