Hey @Soly
Here's a script I wrote for you with this mornings coffee, for use with the Scripting Extension.
It demonstrates how to create a "records" object of 3 appointments, that will then stamp into your table. There's a bit to learn with how to use Date Objects within JavaScript - they will take some time to get used to - and my example might not be the most efficient way of filling Date and Time fields (although it works as I'd hoped).

Simply run the script to create 3 records.

This could further be placed into an Automation, and executed on a set period to create records each evening, or once a week, whatever/whenever you need really.