It was a Monday.
21 November 1957 was a Thursday.
21 July 1957 was a Sunday.
Friday
Thursday
21 October 1950 was a Saturday.
21 October 1990 was a Sunday.
October 21, 1945 was a Sunday.
October 21 1861 was on a Monday.
October 21 1992 was a Wednesday
October 21, 1999 was a Thursday.
October 21 2010 was a Thursday.
October 21, 1940 was a Monday.