The Qingming Festival falls on or around April 5th on the Gregorian calendar, the 15th day after the vernal equinox, every year, and is not fixed. But the most common dates are April 4 and April 5, with April 5 being the most common for Qingming Festival.

The original "twenty-four solar terms" were based on the pointing of the handles of the seven stars of the Big Dipper. The handle of the Big Dipper started from the "c position" and rotated clockwise, and when the handle pointed to the "b position", it was the Qingming Festival. "B position" is the sun's yellow longitude reaches 15 degrees, just this time in the annual lunar calendar around April 5th. For the sake of memory, people directly record the time of Qingming Festival as April 4th - April 6th.

Customs of Qingming Festival:

1. Sweeping tombs and paying homage to ancestors: not only promotes the traditional filial piety culture of our country, but also strengthens the cohesion of the family and even the nation.

2. Tomb-sweeping: people will take the opportunity of tomb-sweeping to play and enjoy spring in the mountains and fields, which not only relaxes the mood, but also increases the affection.

3. Wearing willow to expel ghosts and ward off evil spirits: With the function of expelling ghosts and warding off evil spirits, "wearing willow" is to weave willow branches into a ring and then wear it on one's head.

4. Eat green dumplings: Eating green dumplings not only prevents diseases, but also the color green represents vitality and longevity, implying a healthy family.