December 15, 1981, was a Tuesday. You can determine the day of the week for a given date using various methods, such as Zeller's Congruence or simply referring to a perpetual calendar. In this case, December 15, 1981, falls on a Tuesday.
November 15, 1981 was a Sunday.
June 15, 1981 fell on a Monday.
15 December 1958 was a Monday.
15 December 1997 was a Monday.
15 December 1935 was on a Sunday.
December 15 1993 was on a Wednesday.
15 December 1980 was a Monday.
December 15 2010 was a Wednesday.
December 15, 1977 was a Thursday.
December 15, 1936 was a Tuesday.
Sunday
December 15 1791 was a Thursday.