I am looking for help with the following problem for an Excel 2003 spreadsheet.

I have 2 colums, 1 with start time and date of an event, the other with the
end time and date. I am looking for a way to determine the elapsed time in
hours per day, expressed as a date, within the specified period, spread over
2 columns

Input:
Column 1 Column 2
14-10-08 22:00 16-10-08 15:00

Output:
Column 3 Column 4
14-10-08 2 hrs
15-10-08 24 hrs
16-10-08 15 hrs

Very grateful for any help.