Hey there Jose,
Welcome to planDisney and thanks so much for your question!
In general, you are able to change the date of your
theme park reservation for tickets as long as they are wholly unused. I will add a caveat here that it may depend on the type of ticket you have (more on that below), but typically when the date of a reservation has passed, you'll need to
speak with a Cast Member at the Tickets line to help make a new reservation.
If it is a multi-day ticket that has been partially used, you would need to
use the rest within 13 days of its first use. If it's a single-day ticket, you might have to pay the difference if you're looking to
book a day with a higher tier. Depending on the type of ticket you have, it's also possible there could be block-out dates, like in the case of the
California Resident Special Offer Tickets. I'm not able to see the exact details of your ticket, so again, your best bet will be to
speak with a Cast Member at the Tickets line and they will be able to let you know what your options are!
Thank you again for your question, Jose! As you continue to plan for your next trip, feel free to come back and see us here at planDisney if you think of any follow-up questions we can help with.
Have a Magical Day,
Greg