Hi Tsuwei,
Welcome to planDisney, and thanks for bringing us your question about purchasing tickets! I hope you're having a BLAST dreaming about all of the magic and fun you'll enjoy during your Walt Disney World Resort adventure!
When purchasing
tickets, you'll notice that the price can vary based on the start date of the tickets. It's possible to stretch your Disney dollars a bit if you choose a start date that's earlier than you plan to arrive, and yes, it's fine if you do that. You're exactly right that the important part is that you plan all of your theme park days prior to the
expiration date on your ticket. Please don't forget to make
Disney Park Pass reservations for each day you plan to visit the parks, too, as you won't be allowed to enter the parks without them. If you are purchasing
Park Hopper Option tickets, you'll only need to make a reservation for the
first park you plan on visiting each day, then you'll be able to hop around, pending any capacity limitations, beginning at 2:00 PM each day.
We're so glad you came to see us here at planDisney, Tsuwei, and we hope you'll stop by again if you have any other questions as you're planning your visit. I'm sending pixie dust that you have a truly magical vacation this
holiday season!
Missy