Elapsed Time between 12:30 and 2:00

A.M. P.M. <-- Enter Time 1
A.M. P.M. <-- Enter Time 2

Calculate the elapsed time between 12:30 P.M. and 2:00 P.M.

2:00 P.M. is greater than or equal to 12:30 P.M. and we must borrow 60 minutes from 1 hour
We treat 12:00 as Hour Number 0
Answer in Hours = 2 - 0 + 1 = 1
Answer in Minutes = 60 + 00 - 30 = 30
Elapsed Time = 1 hour and 30 minutes