Hi,
Strange - this is the second time this question has come up recently. I don't see it for years, then twice in a few days!
Try the following:
Three query calculations are required:
Working Days from 1900 to Start Date:
(floor(_days_between([Start Date],1899-12-31)/7) * 5) + (mod(cast(_days_between([Start Date],1899-12-31), integer),7))
Working Days from 1900 to End Date:
(floor(_days_between([End Date],1899-12-31)/7) * 5) + (mod(cast(_days_between([End Date],1899-12-31), integer),7))
Working Days from Start Date to End Date Inclusive:
if ( mod (cast(_days_between([End Date],1899-12-31),integer) , 7 ) = 6) then ([Working Days from 1900 to End Date] - [Working Days from 1900 to Start Date])
else ( [Working Days from 1900 to End Date] - [Working Days from 1900 to Start Date] + 1 )
Best regards,
MF.