Assuming that the 05:00 is the following morning try

=C5-A5+(C5<A5)

or


=MOD(C5-A5,1)


HTH

Sandy
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"dokliver" wrote in message
...
I am attempting to do a calculation for hours worked using the 24-hour
format
but have run into a problem. A simple minus calculation such as (C5-A5)
does not yield an accurate calculation if the time value for A5 is greater
than C5. Can you suggest a format/formula to use is my punch out time is
17:00pm and punch in time is 05:00am?