alarm for Ubuntu 20.04

Is there an alarm app for ubuntu 20.04?

Features: 1)In alarm we need to set the time at which it should ring.Not the remaining time from now.

2)(optional) should ring untill I stop atleast some reasonable ringing time

Solution 1:

There are a couple of GNOME shell extensions you can use for this.

Reminder Alarm Clock

Or this one Alarm Clock which also shows up the name of the upcoming alarm:

and lastly, there is

downloadable from the ubuntu software center.

Solution 2:

That is what, among other possible applications, the Gnome Clocks application does if you use the default Ubuntu version. If it is not installed, then you can install it with the command sudo apt install gnome-clocks.