It was a Monday.
December 21.
It was a Sunday.
It was a Monday.
It was a Tuesday.
No
It was a Wednesday.
21 December 1989 was a Thursday.
21 September 1970 was a Monday.
May 21 1970 was a Thursday.
April 21, 1970 fell on a Tuesday.
January 21, 1970 fell on a Wednesday.
Well the first day of winter is Dec. 21. So I would guess the last day of fall would be Dec. 20