I believe our local noise ordinance is 10 pm to 7 am M-F, and 10 pm to 8 am on the weekend. Fortunately, they also passed an ordinance that sez as long as I'm willing to sign a noise complaint, regardless of the time, the cop has to write the ticket, and it goes to court.
We have Mexican neighbors who have a party/jumphouse business. They have huge parties in their backyard several times per year, (kids b-days and such) and they usually hire a DJ and sound system. You can hear the loud cucaracha music for a couple of miles...and it goes until 11 pm every time.
I've gone down there several times and asked them to turn it down...and gotten nowhere. I finally had enough a while back and started calling the cops every time it gets too loud. Fortunately, it's never gotten to the point where I have to actually sign the complaint...once the cops show up and threaten them with it...it quiets down. They've gotten a couple of tickets for disturbing the peace on after-hours calls (after 10 pm) because of the loud music. You'd think they'd learn sooner or later.
The last couple of times the cops came out, they also checked all the cars parked on the street...and wrote half a dozen parking tickets...expired plates, parking in front of driveways, etc.