Hello JuniorZR,
Welcome to the Microsoft Community.
From your description, sorry to hear that you have experienced some issues.
Per your issue, I would like to check some information. If my understanding is correct, when you switch to New Outlook, all the events shift to one day earlier. May I know whether the events changed in the outlook web app as well?
The new outlook is more like outlook web app, could you please also check whether the time zone been changed for new outlook by clicking on settings > general > time and range > time zone. And please also kindly check the time zone for your system.
Looking forward to your reply. Best regards,Tan-Ly - MSFT | Microsoft Community Support Specialist