The hours of operations for Disneyland vary they have shorter hours in the fall and winter. Right now they are opening at 9am. During select times such as holidays, special events, and school breaks they will be opening at 8am. I suggest you find out when you wanna go then check the website.
The various Disneyland theme parks open at different times on different days, and there doesn't seem to be any particular pattern. Generally, they open in the morning between 8 and 10 am. A detailed calendar can be found on the Disneyland website, under "Plan>Park Hours"
Disneyland typically opens at nine a. m. ,Monday through Thursday. On Friday and Saturday mornings,they open an hour earlier,at eight a. m. On Sunday,they open an hour later,at ten a. m. These hours are subject to change.