August 15 the mourning day of Zhouqu mudslide was not decided according to the custom of the seventh day?

What a coincidence that these two days are the same day. Sixty-five years ago today, Japan declared its unconditional surrender to China. Today is also the national mourning day for the victims in Zhouqu. This day was chosen because it was the seventh day of the catastrophic mudslide disaster in Zhouqu and the "first seven" of the folk tradition. During the Wenchuan earthquake, the three-day mourning day began on the seventh day, wishing the people of Zhouqu an early reconstruction of their beautiful homeland.