How to learn how many the working days in a month?
mr_max 
(BOB member since 2008-06-25)
You shouldn’t really do this at a report level, but heres a very clever post to get you started:-
Its for Deski, so you will have to convert to Webi syntax:-
https://bobj-board.org/t/73436
Mak 1 
(BOB member since 2005-01-06)