Your code doesn't seem to exclude weekends, it only excludes hours. Since hours can happen in any given day, you're excluding those hours on weekends as well.
Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?
How to post data/code on a forum to get the best help: Option 1 / Option 2