Subtracting Night-time-hours

[Guest]

I have a workbook that captures the hours that someone has spent reviewing
documentation (i.e. The time they received it and the time they returned it),
and then it totals the hours. The problem I am having is that if they happen
to not return the document until a few days later than I get an exorbitant
result when in actuality there is only 9 working hours a day and only five
days a week.

Here's what I'm looking at...

Col C Col D Col E
Row 439 08-29-06 9:10 AM 09-01-06 8:01 AM 70 hours 51 minutes ' Derrived
from this code -- =IF(D439<>FALSE,D439-C439,"")

I need it to be this...

Col C Col D Col E
Row 439 08-29-06 9:10 AM 09-01-06 8:01 AM 25 hours 51 minutes ' by
subtracting 15 hours for each night


Does anyone know how I can mathimatically accomplish this by modifying this
code so that it accounts for the evenings and weekends? --
=IF(D439<>FALSE,D439-C439,"")


Thank You Sooo Much.
Rob

 

[Tom Ogilvy]

http://www.cpearson.com/excel/DateTimeWS.htm
Working Days And Hours Between Two Dates And Times

 

[Guest]

Holy Cow... Is there an easier way that's not so confusing?

 

[Guest]

OK That gave no help. I did the whole names thing but It doesn't compute the
specific days that I need it to compute and I can't figure out how to make
the codes on that page work with what I need to do.


Feeling Bummed,
Rob