Why can't the next day be regarded as divination? What's the point?

It's not a minute of the day, but a minute of the day, because the minute of the day involves the change of the date, and it's easy to make a translation error because of the obvious solar time error, which leads to the date error.

take for example

Today is the sea day, and it will be midnight after tonight 1 1. However, due to the local time, if the calculation is wrong, the conversion result may be 10: 40 at night. Then it's time for the sea.

So generally speaking, divination is not recommended.