How to check that the date is three stars?

Different from fleeting stars and Ryutsuki stars, it is necessary to divide a year into two parts to calculate the daily stars. The numbers after the winter solstice are in reverse order, and those after the summer solstice are in reverse order. That is to say, the star on duty from winter to Jiazi Day in the future is a white star, the star on duty after rain is seven red stars, and the star on duty after Jiazi Day in Grain Rain is four green stars. Need to calculate the daily star on duty after these three solar terms. The star on duty for Jiazi Day from summer to the future is nine purple Star, the star on duty for Jiazi Day after summer heat is Sanbi Star, and the star on duty for Jiazi Day after the first frost is White Willow Star. The sundial stars after these three solar terms should be counted by the reciprocal.