I am using excel for invoices & billing. The file name is the same as the
invoice number. how do I format a cell to do this automatically? Is there a
formula for this? and also, I also need to calculate time: say start time is
8:00am - finish time is 11:15am, is there a formula to caculate 3.25 hours?
any help will be greatly appreciated!

to do the time, do finish time minus start time, just make sure the
cell is formatted as H:MM (or possibly better, [H]:MM) - this would
show as hours and minutes. IF you actually need that and as a decimal,
then multiply the result by 60 * 24

Not sure what you mean by the first part of the question but hopefully
someone else does!

In response to your time difference query, try searching this forum for 'time
difference' - there are numerous answers to the question

"jack_mel" wrote:

I am using excel for invoices & billing. The file name is the same as the
invoice number. how do I format a cell to do this automatically? Is there a
formula for this? and also, I also need to calculate time: say start time is
8:00am - finish time is 11:15am, is there a formula to caculate 3.25 hours?
any help will be greatly appreciated!

If you want to put the file name into a cell, then use:

=MID(CELL("filename",Z100),FIND("[",CELL("filename",Z100),1)+1,FIND("]",CELL("filename",Z100),1)-FIND("[",CELL("filename",Z100),1)-1)

will return something like:

Book1.xls

=MID(CELL("filename",Z100),FIND("[",CELL("filename",Z100),1)+1,FIND("]",CELL("filename",Z100),1)-FIND("[",CELL("filename",Z100),1)-5)

will return

Book1
--
Gary''s Student


"jack_mel" wrote:

I am using excel for invoices & billing. The file name is the same as the
invoice number. how do I format a cell to do this automatically? Is there a
formula for this? and also, I also need to calculate time: say start time is
8:00am - finish time is 11:15am, is there a formula to caculate 3.25 hours?
any help will be greatly appreciated!