135780 After a slight cold, it is a bad cold.

You have mixed two different formulas.

135780 wax, 3 1 day is not bad. -This is the formula of the number of days in the solar calendar month.

After the slight cold, there is a great cold, and after the great cold, it is the New Year. These are the last two solar terms in the twenty-four solar terms of the lunar calendar. Slight cold, severe cold, after the severe cold, the New Year will be celebrated.