2. Tomb-Sweeping Day is a Gregorian calendar date, which is fixed between April 4th and April 6th in Gregorian calendar every year. Someone asked Tomb-Sweeping Day when the lunar calendar was wrong. The lunar calendar date in Tomb-Sweeping Day is different every year. When the sun moves to a specific position, it is the Gregorian calendar date. For example, the year before last in Tomb-Sweeping Day was April 4, 20 16, which had nothing to do with the lunar calendar.