that would be a Friday
November 13, 1984 was a Tuesday.
September 13 1984 was a Thursday.
8-13-1984 was a Monday.
October 13, 1984 fell on a Saturday.
13 July 1989 was a Thursday.
13 July 1970 was a Monday.
13 July 1957 was a Saturday.
13 July 1995 was a Thursday.
July 13, 1956 was on a Friday.
July 13 1963 was a Saturday.
July 13 1949 was on a Wednesday.
July 13 1947 was on a Sunday.