It was a Monday.
February 13 1975 was on a Thursday.
June 13, 1975 was a Friday.
August 13, 1975 fell on a Wednesday.
May 13, 1975 fell on a Tuesday.
13 January 1954 was a Wednesday.
13 January 1943 was a Wednesday.
13 January 1971 was a Wednesday.
January 13 1927 was a Thursday.
January 13, 1967 was a Friday.
January 13 2000 was a Thursday.
January 13, 1998 was on a Tuesday.
January 13, 1983 was a Thursday.