I booked a hotel for two days and paid a fixed fee, but I want to go one day later. I wonder what the hotel will do.

In this case, you should immediately negotiate with the hotel and explain your actual situation, which will generally be understood by the hotel. They'll put it off on time and won't settle with you. But if you don't communicate with them in time, it's usually the second half of 13 pm. I may not care that I met an accommodating hotel. In short, we should communicate immediately, instead of clarifying the situation first.