It was a Saturday.
April 21 1991 was a Sunday.
December 21, 1991 was a Saturday.
The day of the week for September 21, 1978 was a Thursday.
June 21, 1991 fell on a Friday.
21 September 2003 was a Sunday.
21 September 1943 was a Tuesday.
21 September 1970 was a Monday.
21 September 1982 was a Tuesday.
September 21 1965 was on a Tuesday.
21 September 1971 was a Tuesday.
September 21 1969 was on a Sunday.
21 September 1977 was a Wednesday.