Did Tomb-Sweeping Day in ancient China also celebrate April 4th of the Gregorian calendar? Was there a concept of Gregorian calendar in ancient times?

There was no Gregorian calendar in ancient China. GM is now called the Gregorian calendar. China's use of the Gregorian calendar began in the late Ming and early Qing Dynasties and was spread by western missionaries. Tomb-Sweeping Day is a traditional folk festival in China, and it is one of the eight important festivals (Shangyuan, Qingming, Long Summer, Dragon Boat Festival, Central Plains, Mid-Autumn Festival, Winter Solstice and New Year's Eve). Generally speaking, it is around April 5th of the Gregorian calendar, and the festival cycle is very long. There are two sayings:/kloc-8 days before 0/0 and 10 days before 0/0. 108 The day after beginning of winter is Qi's Tomb-Sweeping Day. Tomb-Sweeping Day gas * * * has 15 days. As it is Tomb-Sweeping Day, the time is after the vernal equinox. "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 to worship ancestors, and the traditional activity is to sweep graves.