Calculate the difference between two datetime objects in Python

dateTimeDifference = dateTimeA - dateTimeB
# Divide difference in seconds by number of seconds in hour (3600)  
dateTimeDifferenceInHours = dateTimeDifference.total_seconds() / 3600

References
https://stackoverflow.com/questions/43305577/python-calculate-the-difference-between-two-datetime-time-objects/43308104