subtracting time

[Guest]

I'm trying to create a formula to help calucate the difference between two
times. My fixed goal is 7:00 minutes, if a persons time falls below or above
7:00 minutes, i want it to show either +/- in minutes and seconds. For
example:
Goal is 7:00 minutes however, a person was able to complete work in 6:00
minutes the formula would show -1.00 minute. Now if a person completes the
work in 7:30, the formula result would show +:30 seconds. Basically, the
less time the better. Any ideas would be great. Currently excel shows
negative time and dates as #######.

 

[Guest]

Pull-down:
Tools > Options > Calculation and check the 1904 box near the bottom