In which dynasty did Tomb-Sweeping Day begin?

Tomb-Sweeping Day began in the Zhou Dynasty.

Qingming is one of the 24 solar terms in the lunar calendar. The traditional Tomb-Sweeping Day in China began in the Zhou Dynasty and has a history of more than 2,500 years. "Almanac": "On the fifteenth day after the vernal equinox, the bucket refers to Ding, which is used for Qingming, when everything is clean and bright, and when it is covered, everything is clean and bright, hence the name." As soon as Qingming comes, the temperature rises, which is a good time for spring ploughing and sowing, so there is a saying that "before and after Qingming, we plant melons and beans".

Tomb-Sweeping Day is a festival in memory of ancestors. Mainly to sweep the grave, sweeping the grave is a concrete embodiment of being cautious and pursuing the distance, caring for the family and filial piety. Tomb-Sweeping Day is at the turn of mid-spring and late spring, that is, after the winter solstice 106 days. The state attaches great importance to the protection of intangible cultural heritage. On May 20th, 2006, this folk custom was approved by the State Council to be included in the first batch of national intangible cultural heritage list.