Yes, we do;
http://vizioneck.com/forum/index.php?topic=687.msg38439#msg38439I'm not quite sure, but in the other topic I thought it was etho who said it depends on how many weeks (from saturday till friday) there are in a month.
If so then it's 4, if not then it's probably 5.
If it was just on Saturdays August would be 5 weeks. If it was how many weeks of sat to fri there are then there would be no 5 week months!