Is it from winter to March 9?

September 19 means several cold days from winter to the future, and the first nine days are called September 19.

Enter "No.9" from the date of winter solstice.

"Counting Nine" is a folk solar term in winter in China.

From winter solstice to Sunday, it is called "Jiujiu", every nine days, the first nine days, the last nine days, and so on, until the ninth nine days, the number reaches 998 1 day.