How about getting married the next day? Is the third-class marriage in eight-character fortune telling a good day? I calculated it online, but it's not clear.

First of all, B-day marriage is a second-class marriage. This kind of marriage is called reproductive marriage, and only when the material basis is equivalent can it be considered marriage. Many marriages of business cooperation in politics are like this. They belong to the external scenery and look like a good match, but in fact they are self-aware, and married people are unwilling but not easy to divorce.