When I was learning basic I created a program that added time.
1 hour 20 minutes and 13 seconds
2 hours 30 minutes and 12 seconds
14 hours 2 minutes
and then I would get an answer when I hit the return key
I created the program in MS Basic, Turbo Pascal and Exel
the program worked the same in each program.
I saved the program to disk and I made paper copies of the formula but I lost them all. I think they are somewhere on a 3 1/2 inch disk.