It was a Saturday.
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 July 1933 was a Friday.
July 21 1946 was on a Sunday.
July 21 1984 was on a Saturday.
July 21, 1959 was a Tuesday.
July 21 1982 was a Wednesday.
July 21 1961 was a Friday.
21 July 1957 was a Sunday.