December 10th 1981 was a Thursday.
December 22 1981 was a Tuesday.
December 18, 1981 was a Friday.
December 21, 1981 fell on a Monday.
December 3, 1981 fell on a Thursday.
December 4, 1981 fell on a Friday.
December 13, 1981 fell on a Sunday.
December 31 1981 was a Thursday.
December 19th, 1981 fell on a Saturday.
It was a Wednesday.
Tuesday!
Wednesday
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.