It was a Sunday.
21 October 1990 was a Sunday.
June 21, 1990 fell on a Thursday.
May 21, 1990 fell on a Monday.
July 21, 1990 fell on a Saturday.
September 21, 1990 fell on a Friday.
21 January 1983 was a Friday.
21 January 1983 was a Friday.
21 January 1953 was a Wednesday.
21 January 2004 was a Wednesday.
21 January 1943 was a Thursday.
January 21 1963 was on a Monday.
January 21 2010 was a Thursday.