refers to the 1th day after death.
the calculation method is (death date +99 days), because the death day is the first day.
if he dies on June 24th, 221, then June 24th is the first day. If you add 99 days, these 99 days include the remaining 6 days in June, 31 days in July, 31 days in August, 3 days in September and 1 day in October, then one hundred days will be October 1st.
In folk customs, families often hold memorial activities 1 days after the death of their loved ones.
Folk customs:
1. In the old days, the filial son didn't entertain guests, drink or entertain, go to other people's houses, shave his head, even take a shower or change his clothes for 1 days, which was called "a hundred days of mourning".
2. After a hundred days, these taboos can be lifted, and filial piety can be gradually reduced. The dutiful son wears only white shoes except white Dai Xiao on important memorial days, and the man wears a circle of white cloth on his hat. Women wear white-headed ropes. In some places, men use self-hat tops and women use white buttons to represent Dai Xiao.
3. When the dutiful son in southern Shaanxi shaves his head, he should leave a tuft of hair on the back of his head to show filial piety, because the ancients thought that "the parents who made their hair and skin suffer" meant that they did not forget the kindness of their parents.