Calculating the Number of Weeks between Dates. Only held on certain days of week (Problem: Holidays)

[borisbe]

I have version 9.

name mon tues wed thurs fri sat sun start_date end_date
test1 Y N Y N N N N 01/13/14 2/24/14
test2 Y N N N N N N 01/13/14 2/26/14

"Y" in a day of the week means it is being taught on those days of the week.

DATEDIFF("w", start_date, end_date, crMonday)+1 so each test shows that it is being held for 7 weeks but I now need to exclude holiday weeks:

test1 would be 7 weeks since they meet on Mon and Wed and only Mondays are holidays
test2 would be 5 weeks since they only meet on Mon so the weeks for MLK Day and President's Day weeks shouldn't be counted

Thanks!

 

[Charliy]

Is MON set to N on days the class is not taught (holidays)?