It was a Tuesday.
21 November 1973 was a Wednesday.
February 21, 1973, was a Wednesday.
June 21 1973 was a Thursday.
April 21, 1973 fell on a Saturday.
October 21, 1973 was a Sunday.
21 August 1933 was a Monday.
August 21, 1950 was a Monday.
21 August 1945 was a Tuesday.
August 21, 1978 was a Monday.
August 21 1996 was a Wednesday.
21 August 1975 was a Thursday.
August 21, 1984 was on a Tuesday.