score:6
My latest I-94 was obtained prior to 9pm so itβs hard to confirm but I believe your answer is that the I-94 dates are stored in the backend in UTC time while the web portal is set to show everything in Eastern Time by default. So any entry past 9pm in LAX will show up as the next day if looked up online.
Overall Iβd try to be cautious and make sure I follow the I-94 date online rather than trying to explain the time zone difference to an immigration officer later on.