For days, you don't need DATEDIF.
=B1-A1 will do, if you format the result as Number or General.
DATEDIF makes sense if you are looking at months and/or years.
--
David Biddulph

Anthony wrote:
On Jan 3, 2:34 pm, jozef carpenter
wrote:
hi all, happy 2009! does someone know the option of calculating the
amount of days between 2 entered dates, so i can claculate the
average electricity use? many thnx in advance. jozef carpenter (so
not yet :-) an excel wizard)

This has worked for me in the past and can be used for number of days,
months, etc. between two dates:
=datedif(A1, B1, "d") where cells A1 and B1 contain the two dates.