Jacob kindly gave me the following formula for working out number of working
days between 2 dates. it is exactly what i was looking for but it seems to
calculate a day less

formula
=(C16-WEEKDAY(C16,2)+WEEKDAY(B16,2)-B16)/7*5-MIN(5,WEEKDAY(B16,2))+MIN(5,WEEKDAY(C16,2))

where c16 is 17th july 2009 and B16 is 13th july 2009

the formula works out 4 days but it should be 5 days

i am also looking to calculate the number of days (in this case 5) by 7.4

many thanks