20th of December 2009 is a Sunday.
20th December 1967 was a Wednesday.
December 20th, 2008 fell on a Saturday.
It was a Sunday.
December 20 2010 was a Monday.
December 20, 1929 was a Friday.
December 20th, 1978 was a Wednesday.
December 20th, 1946 fell on a Friday.
December 20th, 1968 fell on a Friday.
December 20th, 1950 fell on a Wednesday. The following year, December 20th fell on a Thursday.
December 20th, 1984 fell on a Thursday.
December 20th 2005 was a Tuesday.