What about "September 19th", "February 29th" and "March 9th" in winter?

Calculate the season from the winter solstice to nine days. The specific calculation method is to count from the winter solstice (around February 22, 65438 in Gregorian calendar today) (the winter solstice is called "Jiujiu", which means the beginning of cold weather), and every nine days are called "Jiujiu", the first nine days are called "Jiujiu", the last nine days are called "Erjiu" and the last nine days are called "Sanjiu".

And so on, until "99", when the number reaches 998 1 day (around March 12 in Gregorian calendar), it is "out of nine" (when the number of nine ends, it will be cold). At this time, winter has passed and spring has arrived.

Extended data:

1929 didn't shoot, but walked on the ice in 3949. There is a folk saying called "Sanjiu Cold". This time is the coldest time of the year, suitable for tonic.

Winter is the season of tonifying kidney. Kidney is very important in the five internal organs and is the foundation of health. People's aging is simply the weakness of the kidney. Therefore, winter is a good time to tonify kidney, resist aging and keep fit.

Tip: Eat more chestnuts. Although many meats have nourishing effects, from a health point of view, vegetarianism is more beneficial to health than meat. If you want to tonify the kidney in winter, you can eat more vegetarian food with the effect of tonifying the kidney, such as chestnuts.

Chestnuts are sweet and warm, and have the effects of nourishing the stomach and strengthening the spleen, tonifying the kidney and benefiting qi, and are not as greasy as meat. It is often used to tonify kidney in health care and dietotherapy. ?

Baidu encyclopedia-Sanjiu

People's Network-It's time for the coldest! This should be finished in three or nine days.