Hello Alexis, and welcome to planDisney!  Thank you for bringing your 
Disneyland Resort ticket question to us, we'd be happy to help!  
As of March 5, 2023, 
one-day tickets that are purchased through the Disneyland site or the 
Disneyland app are valid now through December 30, 2024.  This should hopefully give you plenty of time to utilize your ticket and plan your trip to the "Happiest Place on Earth!"  You will also need to make a corresponding 
theme park reservation as well to go along with your ticket, and you can check for 
theme park availability for both parks in advance.  
If you'll be visiting the Disneyland Resort this year, you cannot miss the 
Disney100 Celebration!  I am most excited for the reopening of 
Mickey's Toontown at 
Disneyland Park, and the new 
Mickey & Minnie's Runaway Railway attraction.  The queue is a cannot miss, as you'll be guided through a "Mickey Through the Ears" journey featuring Mickey's movies, props, and memorabilia through the years!  
I hope this information was helpful for your planning Alexis, and if you have any other questions, please do not hesitate to come back to planDisney!
Have a magical day!
Melissa