I need to be able to calculate the number of hours from beginning of
procedure to end of procedure.

I download from another system which unfortunately puts the start date in
one column and the time in another. I currently retype the date/time into a
third column to use for calculations.

To save re-typing and reduce potential errors in manually copying, I would
like to be able to use a formula to take the date from one column and the
time from another and place it in a third.

Any help would be appreciated!