We aim to have the park hours in our system match what Disney and Universal publish on their respective web sites and apps. For dates where hours are not yet on those websites, we predict park hours based on similar dates in the past.
Note about Universal Orlando
Specifically regarding Universal Orlando, park hours (and the Early Park Admission schedule) in Universal's official app have frequently been different from the hours on its website. We have found the app's hours to be more reliable, so that is what we use when there is a conflict.
If you called your hotel and had a worker there tell you information that is not on their employer's app or public website, or if some other website claims to have "official" hours, those sources may be correct. However, we are not going to adjust the park hours displayed on TouringPlans.com based on that information. We only update park hours if they change on the Disney or Universal websites and apps.
When park hours change or are released, park operators do not send us a memo. We need to notice those changes on our own and then update our data, a process that may take 24-48 hours. If you notice that are hours have been out-of-sync with what is on Disney or Universal's website/app for a couple of days, please submit a request to let us know.
Finally, note that even "official" hours are subject to change, so keep an eye on them as your travel dates approach.