How to set alarm in appointment set

[Renato Pontefice]

I, I use the syntax:
°° xxx yyy zzz <2024-08-29 Thu 15:45>
To set a date.
How can I set an advice (1 or 2 hour) before?
I mean: I would receive an alert 1 or 2 hour before that alert me of the new 
appointment
.
Can I set emacs using init.el or something else to advise me some time before 
that there is a date? Or is there some specific syntax that help me to alert 
some time before?

Thank you

Renato