Hi, Juan!
Welcome to planDisney, and thank you very much for sharing your question with us!
I'm glad to share that you can change your park reservation date as long as there's availability for your desired theme park on your new date. To check availability, you can
look at this calendar and see the availability for
Disneyland Park and
Disney California Adventure Park.
Once you know there's availability for your dates, you will log into your account, hover over the "My Disneyland" menu, and click on "
Ticket and Reservation Details." You will then click on "
View My Park Reservations" to see your existing reservations. You will then cancel your current reservations and make new ones for your desired dates.
Timing is essential in this stage of the process, as availability is not guaranteed until you secure your next reservation and receive an email confirmation, so be fast!
I hope this little step-by-step helps you plan a great trip to the Disneyland Resort, Juan. Let us know if you need more help, okay?
May the magic be with you,
Julie