I'm sure someones going to come up with something much more elegant but try:-

=((A2-A1)*24)-(COUNTIF(C1:C8,"<"&A2)*24)-(COUNTIF(C1:C8,"<"&A1)*24)

Start date and time in A1
End date and time in A2
Holiday list in C1 to C8 (allows 24 hrs for each holiday)
Format formula as general

Mike

"douwe" wrote:

Hi,

Can anyone help me on the calculation of the time elipsed between start
date/time and end date/time, inculding weekend days and excluding holidays. I
have tried using NETWORKDAYS; but that can't handle the weekend days. Tried
using WORKDAY; but there I cannot subtract the two dates.