Dec 13, 1990 was a Thursday.
Tuesday
It was a Sunday.
It was a Friday.
Monday
Thursday
Dec 13th 1961 was a Wednesday.
December 13 1985 was on a Friday.
December 13 1958 was a Saturday.
December 13, 1963 was a Friday.
December 13, 1972 was a Wednesday.
From a perpetual calendar: December 13, 1965 was on a Monday.
August 13, 1990 was a Monday.