Disneyland's hours of operation in August are 8am until midnight. Hours are subject to change, however, so it is a good idea to check the Disneyland website for updates.
The park is open from 8am to midnight until August 29th. On August 30th and 31st it is open from 9am to 11pm. They have fireworks every single night too.
You have to consider that Disneyland is an amusament park for childrens, so hours are set for every activity. You can check this hours on their Internet page so you can plan your trip right.
