How many days is the difference between cold food and Qingming?

The difference between the two solar terms is 3 days. The Cold Food Festival is from winter to the future in the summer calendar 105, and from winter to the future in Tomb-Sweeping Day 108.

Cold Food Festival, also known as "Smoke-free Festival", "Cold Food Festival" and "15th Festival", is from summer to the future 105, one or two days before Tomb-Sweeping Day. When the first day of the day is a holiday, smoking is forbidden and only cold food is eaten. In the development of later generations, the customs of sweeping, climbing, swinging, cuju, crochet and cockfighting were gradually increased. The Cold Food Festival lasted for more than 2,000 years and was once called the largest folk festival. Cold Food Festival is the only traditional festival of Han nationality named after food customs. Later, because cold food was close to Qingming, people combined cold food with Qingming before crossing Tomb-Sweeping Day.

Tomb-Sweeping Day, also known as the Walking Festival, is at the turn of mid-spring and late spring, that is, the first 108 day from winter to the future. It is a traditional festival in China, and it is also one of the most important festivals to worship ancestors and sweep graves. The traditional Tomb-Sweeping Day of the Han nationality in China began in the Zhou Dynasty and has a history of more than 2,500 years. Influenced by the Han culture, 24 ethnic minorities in China, such as Manchu, Hezhe, Zhuang, Oroqen, Dong, Tujia, Miao, Yao, Li, Shui, Jing and Qiang, also have the customs of Tomb-Sweeping Day. Grave sweeping, ancestor worship and outing are the basic themes.