Date/Time

Hi
I have a problem with a time date format
Im setting up a simple scoring sheet for races which may start on one day and finish on the next.

I can get it working in the format dd/mm/yy hh:mm:ss but the seconds arnt displayed in the cell. I have a start time cell, and a finished time cell from here I can convert it in to the hh:mm:ss elapsed time format requiredeasily enough. But I still need the seconds displayed in the finish and start time cells.

So if anyone has any clues or suggestions or easier ways of tackling the problem let me know!

Thanks!