The old man died on the fifteenth day of the first month, okay?

You cannot choose the date of death. If it is good for future generations, it depends on the merits of the old people themselves and those of future generations, and has nothing to do with the days.

Understand the feelings of family members. If I were an old man, I would also support my children and grandchildren. Living is pure suffering. Besides, I just checked the Gregorian calendar, and 15th, 16th and 21st are suitable for burial. Look at the customs at home. Some people will not be buried until a few days after their death.