hello.

i have a xls with 3 rows with the cell fprmat as time hh:mm

example of the values
col 1 - nr of hh:mm worked on a day
col 2 - nr of standard hh:mm to work on a day
col 3 - calcualated - col1 -col2 - it shows if someone has worked more or
less then the default time

example

08:00 08:00 00:00 ok
09:30 08:00 01:30 ok
07:00 08:00 Problem !!!! - i want here to have -01:00

is this possible?
thanks