What are the first three days in Tomb-Sweeping Day and the last three days in Tomb-Sweeping Day?

"Three before and four after" means that Tomb-Sweeping Day had better go to the grave to burn paper three days before or four days after.

Tomb-Sweeping Day: The first three days, that is, the first three days are: Gregorian calendar: April 1, 2, 3. Lunar calendar: February 24th, 25th, 26th, Friday, Saturday and Sunday. Tomb-Sweeping Day: April 4th, February 27th, Monday, (16: 28). Tomb-Sweeping Day: The last four days are the following four days: Gregorian calendar: April 5th, 6th and 7th. Lunar calendar: February 28th and 29th, March 1st and 2nd, Tuesday, Wednesday, Thursday and Friday.