Creating an alert 2

Hello,
I would like a user to be able to create alerts based on the day and time.
For example every Tuesday at 5:00 p.m.
And when it’s Tuesday and it’s 5:00 p.m., her phone vibrates and / or rings.

I thought about making a table with the alerts, but I can’t even create a “Day”.

Do you have a solution ? Thank you.