Sometimes I have a need to set an alarm for an 3 hours and 30 minutes starting from a slightly different time every day, and sometimes starting from a time in the past. This lets you easily set this kind of alarm without doing any mental math.
When you run the shortcut, it will ask a series of questions:
It performs the calculations to figure out what time the alarm should be, then it creates that alarm.
The shortcut collects the answers to the questions and saves them as variables. It uses the math values to do the calcuation to find the desired time, then it creates an alarm with those values.