Hi there Hussein,
Welcome back to planDisney! It sounds like you're considering a visit to the Disneyland Resort on New Year's Eve - how exciting!
I just checked and it does look like the New Year's Eve information is already available on the
Hours & Events schedule on the Disneyland Resort website. The information I'm seeing on that page as of the time that I'm writing your answer is that Disneyland Park will be open from 8:00 AM to 2:00 AM on December 31 and that you'll have two opportunities to see New Year's Eve Fantasy in the Sky Fireworks Spectacular that night - at 9:00 PM and again at 12:00 AM to ring in the new year. Note that these times and showings are subject to change.
It looks like there is also currently a Disney Holiday Dance Party planned for 7:00 PM and 1:00 AM as well!
If you're planning on visiting on that day, my recommendation would be to download the
Disneyland Resort mobile app so you can see all the details for your visit on the maps tab. You can click the down arrow near the top center of the screen and select "Entertainment" to see everything planned for that day.
It's sure to be an incredibly exciting time to visit the Happiest Place on Earth, and I can't think of many better ways to ring in the new year. Thanks again for your question, Hussein!
Have a Magical Day,
Greg