December 18th, 2007 fell on a Tuesday.
December 18th, 1956 fell on a Tuesday.
December 18th, 1918 fell on a Wednesday.
Monday
December 18, 1969 was a Thursday.
December 18th 1968 was a Wednesday.
December 21, 1991 was a Saturday.
The question was asked on the 18th of December 2011. In 1994 the 18th of December was on a Sunday.
December 12, 1991 fell on a Thursday.
December 3rd, 1991 fell on a Tuesday.
December 17, 1991 fell on a Tuesday.
December 15, 1991 was a Sunday.