Monday.
September 1 1971 was on a Wednesday.
December 1, 1971 was a Wednesday.
April 1, 1971 fell on a Thursday.
February 1, 1971 fell on a Monday.
December 1, 1971 fell on a Wednesday.
January 1, 1971 fell on a Friday.
June 1, 1971 fell on a Tuesday.
It was a Thursday.
Sunday
1 November 1970 was a Sunday.
1 November 1951 was a Thursday.
1 November 1978 was a Wednesday.