It was a Friday.
6 December 2005 was a Tuesday.
December 5 2005 was a Monday.
December 22, 2005 was a Thursday.
25 December 2005 was a Sunday.
December 31, 2005 was a Saturday.
December 18th, 2005 fell on a Sunday.
December 20th 2005 was a Tuesday.
December 13, 2005 fell on a Tuesday.
December 27, 2005 fell on a Tuesday.
December 29, 2005 fell on a Thursday.
December 1, 2005 fell on a Thursday.
December 9th, 2005 fell on a Friday.