Bash script: difference in minutes between two times

Question

I have two time strings; eg. \"09:11\" and \"17:22\" on the same day (format is hh:mm). How do I calculate the time difference in minutes between these two?

Can the

Answer 1

MPHR=60
CURRENT=09:11
TARGET=17:22
echo $(( ( 10#${TARGET:0:2} - 10#${CURRENT:0:2} ) * MPHR + 10#${TARGET:4} - 10#${CURRENT:4} ))