I have a table like this (the C column is blank):

     A          B           C

1  19:30      23:00       (3.50)

2  14:15      18:30       (4.25)

I need to calculate the time difference in each row between column A and column B (always B - A), and put it in column C as a decimal number (as shown inside the parentheses).

Which formula should I use? Is it possible to generate a general formula, so I won't have to change the row number every time (maybe INDIRECT)?


If you use MOD that will also work when the times cross midnight, e.g. in C2


copy formula down column and the row numbers will change automaticaly for each row


This will do the job:


You might need to format the cell as number, not time!

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