Hi Mark

It should be B1-A1, but in order to cope with times crossing the 24 hour
barrier, use
=MOD(B1-A1,1)

--
Regards
Roger Govier

"Mark" wrote in message
...
I have an instance where we are using excel to calculate work times
however
on some calculations an error appears. I am told that excel does not
calcuate
or recognize negative time differences. The formula that I am currently
using is A1-B1. Is there any way to over come this?

Time In Time Out Hours Worked
6:00 AM 6:30 PM ####
6:30 PM 6:00 AM 12:30

Thanks in advance for your help.
--
Mark